A drug A & B compared, all are true except____________?
A. 1 mg of a causes same effect of 3 mg of b, so a is more potent
B. 1 mg of a cause effect not even caused by maximum tolerated dose of b, so drug a is more efficacious
C. 1 mg of a cause effect not caused by 1 mg of b so a is more efficacious
D. Efficacy is not dose dependent