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Option 1: "in their own brains"
Explanation: The text discusses how the placebo effect allows some individuals to access their body's natural painkillers, endorphins. The phrase 'in their own brains' directly relates to this concept, as it indicates the location where endorphins are produced and suggests a connection to the neural processes involved in pain management.
Option 2: "in their hearts"
Explanation: This option is incorrect because the text specifically refers to the brain as the source of endorphins. The heart does not play a role in the production of endorphins, making this option irrelevant to the context of the text.
Option 3: "of their feelings"
Explanation: While feelings may be influenced by endorphins, this option does not accurately reflect the text's focus on the brain's role in producing these natural painkillers. It is too vague and does not connect directly to the scientific explanation provided.
Option 4: "from the muscle"
Explanation: This option is incorrect as it suggests that endorphins are sourced from muscles, which contradicts the text's assertion that endorphins are produced in the brain. The context emphasizes the brain's role in pain management, making this option misleading.
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