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': 'Increasing severity of mental retardation of male members over generations is a result of ? \nSelect and explain. \nA. Mitochondrial DNA mutation, B. Frameshift mutation, C. Y linked disorder, D. Trinucleotide repeat mutation', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Trinucleotide repeat mutation", 'role': 'assistant'}]