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: Medicine
[{'content': 'Etiology of disordered coagulation in antiphospholipid syndrome is \nSelect and explain. \nA. Hyper coagulation, B. Slow blood flow, C. Thrombocytosis, D. Vitamin K inobsorption', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]