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 statement regarding autosomal dominant disorder - 
Select and explain. 
A. Present early in life, B. Complete penetrance common, C. New germ cell mutations in old fathers, D. -
C: New germ cell mutations in old fathers
Answer: C: New germ cell mutations in old fathers 
Explanation: . New germ cell mutations in old fathers