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
When two different chemicals act on two different receptors and their response is opposite to each other on the same cell, this is called as: 
Select and explain. 
A. Physiological antagonism, B. Chemical antagonism, C. Reversible antagonism, D. Competitive antagonism
A: Physiological antagonism
Answer: A: Physiological antagonism 
Explanation: None