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
True about autosomal dominant type of inheritance: 
Select and explain. 
A. 25% affected & 50 % carrier, if one parent affected, B. 50% affected & 75 % carrier, if both parent affected, C. 75% affected, if both parent affected, D. 50% affected, if one parent affected
D: 50% affected, if one parent affected
Answer: D: 50% affected, if one parent affected 
Explanation: Answer- D. 50% affected, if one parent affectedAutosomal dominant disorders are manifested in the heterozygous state .Both males and females are affected.Because the alleles segregate randomly at meiosis, the probability that an offspring will be affected is 50%.