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
True about denaturation of proteins is all except: 
Select and explain. 
A. Unfolding occurs, B. Disruption of secondary structure occurs, C. Sequence of amino acids remain the same, D. Biological activity is retained
D: Biological activity is retained
Answer: D: Biological activity is retained 
Explanation: D i.e. Biological activity is retained