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': 'A young person presents with a history of severe menorrhagia. She has palpable spleen. Her bleeding time is prolonged with a normal clotting time. Platelet count is normal .The most likely diagnosis is - \nSelect and explain. \nA. Haemophilia, B. Henoch-Scholeim purpura, C. Thrombosthenic purpura, D. Allergic purpura', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]