Select the correct statements from the following.

(a)    Heroin, commonly called smack, is a white, odourless, bitter crystalline compound.

(b)    Excessive dosage of cocaine causes hallucinations.

(c)    Nicotine is a depressant and slows down body functions.

(d)    Cocaine is obtained from coca plant Erythroxylum coca, native to South Africa.

Heroin, commonly called smack, is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound.

Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy. Excessive dosage of cocaine causes hallucinations.

Nicotine is a stimulant. Drugs like heroin are depressants and slow down body functions.

Cocaine is obtained from coca plant Erythroxylum coca, native to South America.