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: Pathology
[{'content': 'X-linked inheritance the risk of a female carrier having an affected child is \nSelect and explain. \nA. 25, B. 50, C. 75, D. 100', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]