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
All the statements are seen in fragile X syndrome except 
Select and explain. 
A. Cardiac murmurs, B. Female preponderance, C. Autism, D. Mental retardation
B: Female preponderance
Answer: B: Female preponderance 
Explanation: None