This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Which is denatured collagen in humans? 
Select and explain. 
A. Gelatin, B. Homocollagen, C. Tropocollagen, D. None
A: Gelatin
Answer: A: Gelatin 
Explanation: heat denatured collagen is gelatin . REFERENCE; DM VASUDEVAN TEXTBOOK SEVENTH EDITION ; Page no;39