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': 'Deficiency of vitamin C causes the following except \nSelect and explain. \nA. Defective collagen synthesis, B. Soft swollen gums, C. Pigeon chest, D. Subcutaneous & other hemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]