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a
Smack is obtained from Erythroxylum.
b
Morphine is often given to persons who have undergone surgery as a pain killer.
c
Chewing tobacco lowers blood pressure and heart rate.
d
Cocaine is a depressant given to patients after surgery as it stimulates recovery.
answer is B.
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Detailed Solution
Smack is obtained from Papaver somniferum. Nicotine in tobacco increases blood pressure. Cocaine activates CNS.Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery.