A) Tea
B) Coffee
C) Cocoa
D) All the above
Correct Answer: D
Solution :
Caffeine \[({{C}_{8}}{{H}_{10}}{{N}_{4}}{{O}_{2}})\], an oxidation product of the methyl derivative of purine is found in coffee beans, tea leaves, cocoa beans, guarana and mate. It is a central nervous system stimulant.
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