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': 'Intron is not found in which DNA ? \nSelect and explain. \nA. Nuclear DNA, B. Mitochondiral DNA, C. B DNA, D. Z DNA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: As already explained, mitochondrial DNA contains no (or very few) introns (i.e. untraslated sequences.', 'role': 'assistant'}]