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B
Alkaloid
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C
Gum
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D
Latex
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Solution
The correct option is A Alkaloid Morphine is an alkaloid obtained from opium (Papaver somniferum). It is used in medicine as pain killer. Morphine is an opioid analgesic drug and the main psychoactive chemical in opium. In clinical medicine, morphine is regarded as the gold standard in management of severe pain. Like other opioids, such as oxycodone, hydromorphone and heroin, morphine acts directly on the central nervous system (CNS) to relieve pain. Thus, option B is correct.