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
Characteristic feature of agonist is - 
Select and explain. 
A. Has affinity only, B. Has affinity as well as intrinsic activity, C. Has intrinsic activity only, D. Neither has affinity nor activity
B: Has affinity as well as intrinsic activity
Answer: B: Has affinity as well as intrinsic activity 
Explanation: Ans. is 'b' i.e., Has affinity as well as intrinsic activity