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
Agonist is having: 
Select and explain. 
A. Affinity with intrinsic activity is 1, B. Affinity with intrinsic activity is 0, C. Affinity with intrinsic activity is –1, D. None
A: Affinity with intrinsic activity is 1
Answer: A: Affinity with intrinsic activity is 1 
Explanation: None