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
Atropine and acetylcholine show the following type of antagonism? 
Select and explain. 
A. Competitive, B. Non competetive, C. Both of the above, D. None of the above
A: Competitive
Answer: A: Competitive 
Explanation: Ans. is 'a' i.e., Competetive