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
[{'content': 'True statement regarding autosomal dominant disorder - \nSelect and explain. \nA. Present early in life, B. Complete penetrance common, C. New germ cell mutations in old fathers, D. -', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . New germ cell mutations in old fathers', 'role': 'assistant'}]