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': 'When a drug binds to the receptor and causes action opposite to that of agonist this is called as ? \nSelect and explain. \nA. Complete Agonist, B. Partial Agonist, C. Inverse agonist, D. Neutral antagonist', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]