Match List I with List II. List I: P sulphonamides; Q antipyretics; R antihistamines; S drugs acting on nucleic acids. List II: 1 pharmacological effect; 2 drug action; 3 chemical structure; 4 molecular target.

AP-3, Q-1, R-2, S-4
BP-1, Q-3, R-2, S-4
CP-3, Q-2, R-1, S-4
DP-4, Q-1, R-2, S-3

Answer: A

Sulphonamides share a structural unit (3). Antipyretics are named by their effect (1). Antihistamines are named by blocking the action of histamine (2). The nucleic-acid group is defined by the biomolecule hit (4).

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