This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure of DNA, Subject name: Biochemistry
Which form of DNA is seen predominantly. 
Select and explain. 
A. A, B. C, C. B, D. Z
C: B
Answer: C: B 
Explanation: Ans. is 'c' i.e. B form: Type of DNADNA can exist in several confirmation depending upon the base composition and under different physical conditions.These are :B- DNA (most common confirmation)A- DNAZ-DNA"Within the cells, most of the DNA is B - DNA although regions rich in guanine and cytosine base pairs may assume 2 - confirmation.A - DNA is not found under physiological condition. When B - DNA crystals are dried the long thin B - DNA molecules becomes short, stubby A-DNA".