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': 'Upshaw-schulman syndrome is: \nSelect and explain. \nA. Inherited thrombotic thrombocytopenic purpura, B. Acquired thrombotic thrombocytopenic purpura, C. Thrombotic thrombocytopenic purpura with anemia, D. Thrombotic thrombocytopenic purpura with bone marrow failure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Upshaw-schulman syndrome is inherited thrombotic thrombocytopenic purpura. Ref: Harrisons principles of internal medicine, Edition -18, Page - 969.', 'role': 'assistant'}]