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': 'Which of the following is increased in hemophilia A: \nSelect and explain. \nA. PT, B. aPTT, C. PT and aPTT, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: An isolated abnormal prothrombin time (PT) suggests Factor VII deficiency, whereas a prolonged activated partial thromboplastin time (aPTT) indicates most commonly hemophilia or Factor XI deficiency.', 'role': 'assistant'}]