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
[{'content': 'Which of the following is not true for Fragile X syndrome? \nSelect and explain. \nA. Hyperextensible joints, B. Small nose, C. Mental retardation, D. Micro-orchidism', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Macro-orchidism is very distinctive feature of Fragile X syndrome present in almost 90% cases.', 'role': 'assistant'}]