Caffeine is one of three naturally occurring compounds known as the .
A) theobromines
B) methylxanthines
C) endorphins
D) tricyclics
Correct Answer:
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Q6: What type of caffeine did 16th century
Q7: Which of the following countries prefers to
Q8: Which of the following contains the highest
Q10: has the highest per capita consumption of
Q11: Caffeine-producing plants are indigenous to .
A)China
B)West Africa
C)North
Q12: Which of the following is notable for
Q13: The United States' consumption of caffeine is
Q14: Tea contains as well as caffeine.
A)theophylline
B)theobromine
C)nicotine
D)acetylcholine
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