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: Medicine
[{'content': 'Oro-oculo-genital syndrome occurs due to \nSelect and explain. \nA. Vit. A deficiency, B. Vit. B1 deficiency, C. Vit. B2 dificiency, D. Nicotininc acid dificiency', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]