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: Medicine
A family consist of husband, wife and children wifes's father has huntington's chorea. Which statment is true - 
Select and explain. 
A. Chance of getting disease in child is 1:4, B. Can occur upto age of 50, C. If wife does not get disease till age 50 children are not affected, D. Huntingion's chorea is due to point mutation in gene
C: If wife does not get disease till age 50 children are not affected
Answer: C: If wife does not get disease till age 50 children are not affected 
Explanation: None