This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pediatrics
[{'content': 'Hemophilia A results due to deficiency of which of the factors: \nSelect and explain. \nA. II, B. VII, C. VIII, D. XI', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C. VIIIHaemophilia's are the most common hereditary clotting defects occurring as X-linked recessive disorders. Haemophilia A is caused by factor VIII deficiency and haemophilia B due to factor XI deficiency:", 'role': 'assistant'}]