This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
[{'content': 'Antidote for heparin is:(1995) \nSelect and explain. \nA. Protamine, B. EDTA, C. Vitamin K, D. Desferrioxamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: aRef: KDT, 5th ed, p. 564, 568 & 4th ed, p. 608, 874- 875', 'role': 'assistant'}]