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
Chances of an offspring being affected when one parent is autosomal dominant heterozygote: 
Select and explain. 
A. 25%, B. 50%, C. 100%, D. None
B: 50%
Answer: B: 50% 
Explanation: 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%