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
Thermo-stability in DNA is contributed mostly by 
Select and explain. 
A. A=T, B. G=C, C. Molecular base, D. Parallel arrangement
B: G=C
Answer: B: G=C 
Explanation: Base Composition.More GC pairs more the Tm.