This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': "Rosenthal's syndrome is due to deficiency of \nSelect and explain. \nA. XI, B. VIII, C. XII, D. IX", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemophilia C(Rosenthal syndrome) It is due to deficiency of factor XI Ref: http://en.wikipedia.org/wiki/Hemophilia_C', 'role': 'assistant'}]