This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
Drug used in heparin overdose is 
Select and explain. 
A. Protamine sulfate, B. Phylloquinone, C. Ticlopidine, D. Clopidogrel
A: Protamine sulfate
Answer: A: Protamine sulfate 
Explanation: Refer Katzung 11/e p 593 Protamine sulfate is antidote of heparin overdose whereas vitamin K is used as antidote for warfarin toxicity