The correct option is C Antipyretics
Analgesics, antipyretics and barbiturates (tranquilizers) are drugs that interfere with the message transfer mechanism from the nerve to receptor and hence block neurological communication.
Antacids are not neurologically active drugs. They prevents the interaction of histamine with receptors present in the stomach wall and result in release of lesser amount of acid.
Hence, option (a), (b) and (c) are correct.