Which part of the Cinchona plant, a drug is obtained?(a) Bark(b) Pericarp(c) Leaf(d) Endosperm

The drug obtained from the Cinchona plant is quinine, which is used to treat malaria. This drug is derived from the bark of the Cinchona tree.

Correct answer: (a) Bark

Explanation:
Cinchona is a genus of flowering plants in the Rubiaceae family, native to tropical regions of South America. The bark of several species of Cinchona contains alkaloids, including quinine, which has been historically used for its antimalarial properties.
The other options are not correct as:
(b) Pericarp is the part of a fruit, not related to Cinchona drug production.
(c) Leaf does not contain the medicinal alkaloid quinine in Cinchona.
(d) Endosperm is a tissue found in seeds, unrelated to the drug obtained from Cinchona.
Therefore, the bark is the correct source of the drug.