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
Which of the following is not true for Fragile X syndrome? 
Select and explain. 
A. Hyperextensible joints, B. Small nose, C. Mental retardation, D. Micro-orchidism
D: Micro-orchidism
Answer: D: Micro-orchidism 
Explanation: Macro-orchidism is very distinctive feature of Fragile X syndrome present in almost 90% cases.