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
[{'content': 'False about Non competitive antagonism \nSelect and explain. \nA. Curve Flattens, B. Irreversible, C. Potency remains same, D. Efficacy remains same', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Efficacy decreases', 'role': 'assistant'}]