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
[{'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 beings, B. Most commercial preparations of heparin are derived from pig intestine, C. Acts via antithrombin activation, D. Produce thrombocytopenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Heparin is the strongest organic acid found in human beings.\nIt acts by activating AT-III that inhibits factor Xa and IIa.\nAdverse effects of heparin are: Bleeding, Osteoporosis, Thrombocytopenia, Hypersensitivity, Alopecia.\nMost commercial preparations of heparin are derived from ox lung and pig intestine.', 'role': 'assistant'}]