This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Types of Genetic Disorders, Subject name: Pediatrics
[{'content': 'True statement about inheritance of an X-linked recessive trait is: \nSelect and explain. \nA. 50% of boys of carrier mother are affected, B. 50% of girls of diseased father are carrier, C. Father transmits disease to the son, D. Mother transmits the disease to the daughter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: For a X-linked recessive disease: If mother is a carrier: If father is diseased: 50% of boys of carrier mothers are affected All daughters are carriers Mothers transmit defective gene to 50% of the sons (diseased) as well as daughters (carriers) Fathers transmit defective gene to daughters', 'role': 'assistant'}]