Sulpha drug is which of the following types of drug ?

Sulpha drugs, also known as sulfonamides, are a group of synthetic antibacterial agents. They were the first chemical substances used systematically to treat and prevent bacterial infections in humans.

These drugs function as competitive inhibitors of the enzyme dihydropteroate synthase (DHPS). This enzyme is critical for the synthesis of folate in bacteria. Because bacteria must synthesize their own folate to survive (unlike humans who obtain it from food), sulpha drugs effectively halt bacterial growth and multiplication (bacteriostatic action).

Other options defined: Analgesics (Option A) are pain relievers like aspirin; Antiseptics (Option C) are chemicals applied to living skin or tissue to prevent infection; and Antipyretics (Option D) are medications used to lower body temperature during a fever, such as paracetamol.