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
Antagonism between acetylcholine and atropine: 
Select and explain. 
A. Competitive antagonism, B. Physiological antagonism, C. Noncompetitive antagonism, D. None
A: Competitive antagonism
Answer: A: Competitive antagonism 
Explanation: None