This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
[{'content': 'Chances of an offspring being affected when one parent is autosomal dominant heterozygote: \nSelect and explain. \nA. 25%, B. 50%, C. 100%, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) 50%(Ref: Robbins 9th/pg 140; 8th/pg 140)Chances of an offspring being affected when one parent is autosomal dominant heterozygote is 50%', 'role': 'assistant'}]