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
Intron is not found in which DNA ? 
Select and explain. 
A. Nuclear DNA, B. Mitochondiral DNA, C. B DNA, D. Z DNA
B: Mitochondiral DNA
Answer: B: Mitochondiral DNA 
Explanation: As already explained, mitochondrial DNA contains no (or very few) introns (i.e. untraslated sequences.