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
[{'content': 'An agonist is having? \nSelect and explain. \nA. Affinity with intrinsic activity is 1, B. Affinity with intrinsic activity is 0, C. Affinity with intrinsic activity is-1, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The agonist is an agent which activates a receptor to produce an effect similar to that of the physiological signal molecule. Affinity is the ability to bind to the target(receptor) intrinsic activity is producing a response after binding Agonist have Affinity with intrinsic activity is 1 Ref; KD Tripathi pharmacology 7th edition (page no; 41)', 'role': 'assistant'}]