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: Pathology
[{'content': 'Prologed PT and Normal PTT may be seen in ? \nSelect and explain. \nA. Thrombocytopenia, B. DIC, C. Vit. K deficiency, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None' o Option a and d are defects of platelets --) Bleeding time is prolonged, PT and PTT are normal. o DIC (causes deficiency of all factors) and vitamin k deficiency (causes deficiency of factor II, VII, IX, X) cause prolongation of both PT and PTT.", 'role': 'assistant'}]