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B
Caffeine
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C
Amphetamine
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D
Tannin
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Solution
The correct option is C Caffeine
Caffeine is a stimulant of central nervous system and present in non-alcoholic beverages like tea, coffee, cola and cocoa. It is a kind of psychoactive drug. It is a bitter and white crystalline purine. It increases alertness and relieves drowsiness and fatigue. It prevents absorption of calcium in bones and hence, excess amount can lead to osteoporosis. Withdrawal of caffeine can cause headache and muscle ache.