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
Action of Antidote of heparin (Protamine) is based on: 
Select and explain. 
A. Competitive antagonism, B. Chemical antagonism, C. Non competitive antagonism, D. Toxic reaction
B: Chemical antagonism
Answer: B: Chemical antagonism 
Explanation: Chemical antagonism