Meaning: 'Reason' refers to a cause or explanation for an action, in this case, the justification for conducting a post-mortem examination.

Wrong options:

• root: The word 'root' implies a fundamental source or origin, which does not fit the context of explaining a common justification for an action.
• point: The term 'point' is vague and does not convey the specific idea of justification needed in this context.
• issue: The word 'issue' suggests a problem or topic of discussion, which does not align with the idea of a justification for performing an examination.

Correct answer: establish

Explanation: The verb 'establish' is appropriate here as it means to determine or ascertain something definitively, which fits the context of determining the cause of death. It is grammatically correct as it follows 'to' indicating an infinitive verb form.

Meaning: 'Establish' means to set up or confirm something, in this case, the cause of death after an examination.

Wrong options:

• create: The word 'create' implies bringing something into existence, which does not fit the context of determining a cause that already exists.
• form: The term 'form' suggests shaping or structuring something, which is not the correct action in the context of identifying a cause of death.
• inaugurate: The word 'inaugurate' means to formally begin or introduce something, which is not relevant to the process of determining a cause.

Correct answer: knowledge

Explanation: The noun 'knowledge' fits well as it refers to the understanding or information gained through experience or education, which is relevant in the context of medical examinations. It is grammatically correct as it follows 'medical' to describe the type of knowledge being pursued.

Meaning: 'Knowledge' refers to the information, understanding, or skills acquired through experience or education, particularly in a medical context.

Wrong options:

• point: The term 'point' is too vague and does not convey the specific idea of understanding or information in a medical context.
• theory: The word 'theory' implies a supposition or system of ideas intended to explain something, which does not fit the context of pursuing medical understanding directly.
• system: The term 'system' refers to a set of connected things or parts, which does not align with the pursuit of understanding in a medical examination.

Correct answer: involves

Explanation: The verb 'involves' is suitable here as it indicates that dissection is a necessary part of the examination process. It is grammatically correct as it follows the subject 'examination' and describes what it entails.

Meaning: 'Involves' means to include or require as a necessary part, indicating that dissection is a key component of the examination process.

Wrong options:

• requires: The word 'requires' suggests a necessity but does not convey the same sense of inclusion as 'involves' does in this context.
• entails: The term 'entails' implies a consequence or result, which does not fit as smoothly as 'involves' in describing the components of the examination.
• necessitates: The word 'necessitates' indicates a requirement but is more formal and less commonly used in this context compared to 'involves'.