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': 'A ring chromosome is a result of- \nSelect and explain. \nA. Inversion, B. Duplication, C. Translocation, D. Deletion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ring chromosome\n\xa0A ring chromosome is a special form of deletion. It is produced when a break occurs at both ends of a chromosome with a fusion of the damaged ends.\xa0If the significant genetic material is lost, phenotypic abnormalities result.\nThis might be expressed as 46, XY,r (14).\nRing chromosomes do not behave normally in meiosis or mitosis and usually result in serious consequences.', 'role': 'assistant'}]