Assertion: Sulpha drug contain sulphonamide group.
Reason: Salvarsan is a sulpha drug.
Assertion
Sulpha drugs contain sulphonamide functional groups. One of the most effective sulpha drug is sulphapyridine.
So, assertion is correct statement.
Reason
Salvarsan is not a sulfa drug as it does not contain sulfonamide functional groups.
So, reason is wrong.
Hence, assertion is correct statement, but reason is the wrong statement.
So correct answer is option (D)