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': 'False about Fragile-x syndrome \nSelect and explain. \nA. Mutation in DMPK gene, B. Second most common cause of mental retardation, C. Macro orchidism, D. High arched palate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mutation in FMR-1 gene (Familial mental retardation-1 gene).', 'role': 'assistant'}]