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
[{'content': 'Collagen formation is affected in deficiency of: \nSelect and explain. \nA. Vit -A, B. Vit -C, C. Vit -B2, D. Vit -D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]