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: Unknown
[{'content': 'Leiden thrombophilia is caused by mutational deficiency of which of the following factors? \nSelect and explain. \nA. FactorV, B. FactorVII, C. Factor IX, D. FactorX', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Robbins Pathology. 9th edition. Page. 135\nFactor V Leiden thrombophilia is an inherited disorder of blood clotting. Factor V Leiden is the name of a specific mutation (genetic alteration) that results in thrombophilia, or an increased tendency to form abnormal blood clots in blood vessels. Factor V Leiden is the most common inherited form of \xa0thrombophilia.', 'role': 'assistant'}]