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
False about Non competitive antagonism 
Select and explain. 
A. Curve Flattens, B. Irreversible, C. Potency remains same, D. Efficacy remains same
D: Efficacy remains same
Answer: D: Efficacy remains same 
Explanation: Efficacy decreases