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': 'Coagulation time of blood is prolonged in: \nSelect and explain. \nA. Hemophilia, B. Leukemia, C. Pernicious anaemia, D. Malignant neutropenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]