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: Physiology
[{'content': 'Triple helix is seen in : \nSelect and explain. \nA. Collagen, B. DNA, C. Elastin, D. RNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Collagen', 'role': 'assistant'}]