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
Antidote of Heparin is: 
Select and explain. 
A. Sodium nitrite, B. Protamine sulphate, C. Thiosulphate, D. Coumarin
B: Protamine sulphate
Answer: B: Protamine sulphate 
Explanation: Protamine sulphate