This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
ED50 is used for determining 
Select and explain. 
A. Potency, B. Efficacy, C. Safety, D. Toxicity
A: Potency
Answer: A: Potency 
Explanation: Ed 50 measures potency Ld 50 measures safety or fatality ed50- dose required to produce 50% of the maximum effect LD50- The dose that causes death in 50 percent of the subjects tested Pgno-54 K D Tripathi Seventh edition