All are surface anaesthetics except -

Ans. is 'b' i.e., Bupivacaine o Topical anaesthesia (surface anaesthesia) is produced by topical application of local anaesthetics to mucous membrane or abraded skin. o Surface anaesthetics are Dibucaine (Cinchocaine) Lignocaine Benoxinate Oxethazaine Prilocaine Tetracaine (Amethocaine) Cocaine Benzocaine Butamben o Procaine has very less potent surface anaesthetic action (1/10) --> not used as surface anaesthetic. o But amongst the given options best answer is bupivacaine, it does not have surface anaesthetic action.