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
[{'content': 'Which one of the following is not true in the case of myotonic dystrophy ? \nSelect and explain. \nA. Cardiac defects, B. Cataract, C. Enlarged testis, D. Frontal baldness', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]