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': 'All of the following are seen with heparin therapy except : \nSelect and explain. \nA. Skin necrosis, B. Thrombosis and thrombocytopenia, C. Osteoporosis, D. Alopecia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]