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': 'Heparin is the commonly used anticoagulant in cardiac surgery.All of the following are true about heparin EXCEPT: \nSelect and explain. \nA. Weakest acid found in living being, B. Most commercial preparations of heparin are derived from pig intestine, C. Acts antithrombin activation, D. Produce thrombocytopenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Heparin is the strongest acid in the body. All the other statements about heparin are true. From medical pharmacology padmaja 4th edition Page no 334', 'role': 'assistant'}]