This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Biochemistry
The most stabilising force for nucleic acids is? 
Select and explain. 
A. Hydrogen bonds, B. Covalent bond, C. Vanderwaals interaction, D. Conformational entropy
C: Vanderwaals interaction
Answer: C: Vanderwaals interaction 
Explanation: A non-covalent interaction differs from a covalent bond in that it does not involve the sharing of electrons, but rather involves more dispersed variations of electromagnetic interactions between molecules Non-covalent interactions can be classified into different categories, such as electrostatic, p-effects, van der Waals forces, and hydrophobic effects. Non-covalent interactions are critical in maintaining the three-dimensional structure of large molecules, such as proteins and nucleic acids Nucleic Acids are also Stabilized by Base Pairing & Stacking. Ref: Biochemistry by U. Satyanarayana 3rd edition Pgno : 69