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': 'Phenomenon called anticipation is seen in? \nSelect and explain. \nA. Mitochondrial inheritance, B. x - linked dominant disorders, C. Trinucleotide repeat expansion, D. Genomic imprinting', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Instablity of triplet repeats can lead to gradual expansion from generation to generation,a phenomenon called anticipation,Genetic anticipation is characterized\xa0 by the reduction in the age of disease onset\xa0 by successive genarations.', 'role': 'assistant'}]