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: Biochemistry
[{'content': 'Components of chromosome are: \nSelect and explain. \nA. DNA, B. tRNA, C. m RNA, D. r RNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. DNA', 'role': 'assistant'}]