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B
Theobromine
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C
Arecoline
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D
Amphetamine
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Solution
The correct option is A Arecoline
Betel nut or areca nut is a fruit of palm tree. It is a mild stimulant because it contains an alkaloid arecoline. Arecoline is a bitter alkaloid and a stimulant of central nervous system (CNS). Stimulants make a person alert and active and increase the excitement. Arecoline mimics the receptors of nicotine in brain and thus, it can have parasympathetic effects also in the body. Generally betel nut is chewed with betel leaf to have a stimulating effect.