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': 'Feature of hemorrhagic disease of new born is - \nSelect and explain. \nA. Prolonged prothrombin time, B. Defective platelet count, C. Prolonged bleeding time, D. Prolonged thrombin time', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]