How might coffee help cure a headache?
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increase energy
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increase heart rate
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constrict blood vessels
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dummy
C
Correct answer
Explanation
Caffeine can help alleviate certain types of headaches, particularly migraines, because it constricts blood vessels in the brain. This vasoconstriction effect reduces the dilation that often causes headache pain. Caffeine's pain relief is not due to increased energy or heart rate, which are side effects rather than therapeutic mechanisms.