This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
ED 50 is a measure of- 
Select and explain. 
A. Toxicity, B. Safety, C. Potency, D. Efficacy
C: Potency
Answer: C: Potency 
Explanation: Ans. is 'c' i.e., Potency Median effective dose o The dose that will produce half the maximum (50%) response. o More the ED, is the potency.