This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Cobalt is a part of which vitamin - \nSelect and explain. \nA. Retinol, B. Pyrodoxine, C. Cyanocobalamin, D. Vitamin C', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Cyanocobalamin o Cobalt is a part of Cyanocobalamine", 'role': 'assistant'}]