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
Which one of the following is not true in the case of myotonic dystrophy ? 
Select and explain. 
A. Cardiac defects, B. Cataract, C. Enlarged testis, D. Frontal baldness
C: Enlarged testis
Answer: C: Enlarged testis 
Explanation: None