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: Orthopaedics
[{'content': 'Not a major criteria of Gurd \nSelect and explain. \nA. Subconjunctival petechiae, B. Thrombocytopenia, C. PaO2 <60mmHg, D. Pulmonary edema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]