Pain Drug 4 A 5 A 4 A 3 A 2 A 4 A 3 A 4 A 4 A 6 B 8 B 4 B 5 B 4 B 6 B 5 B 8 B 6 B 6 C 7 C 6 C 6 C 7 C 5 C 6 C 5 C 5 C