The correct option is (4) as A. Cocaine – Obtained from plant Erythroxylum coca, stimulating action on CNS. B. Heroin – Formed by the acetylation of morphine which is obtained from plant Papaver somniferum. C. Morphine – Obtained from Papaver somniferum, is an effective sedative in surgery. D. Marijuana – Obtained from Cannabis sativa, produces hallucinogenic effect and affects cardiovascular system of the body.