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
Which form of DNA is predominantly seen: 
Select and explain. 
A. A, B. C, C. B, D. Z
C: B
Answer: C: B 
Explanation: C i.e. B The most common form of DNA is B- DNAQ. Within the cells most of DNA is B -DNA, although regions rich in guanine and cytosine base pairs may assume Z- conformation.