In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Sulpha drug contains sulphonamide group.

Reason : Salvarsan is a sulpha drug.

Assertion is correct statement but reason is wrong statement.

Sulfa drug, also called sulfonamide, any member of a group of synthetic antibiotics containing the sulfanilamide molecular structure. Sulfa drugs were the first chemical substances systematically used to treat and prevent bacterial infections in humans. Paul Ehlrich a German bacteriologist was investigating Arsenic based structures in order to produce less toxic substances for the treatment of syphilis. He developed the medicine, arsphenamine, known as salvarsan. Salvarsan is not a sulpha drug.
Hence, assertion is correct but the reason is wrong.