This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Nutritional Deficiencies, Subject name: Social & Preventive Medicine
[{'content': 'Vitamin for which only animal source is available is:- \nSelect and explain. \nA. Vitamin B1, B. Vitamin B2, C. Vitamin B12, D. Vitamin C', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Vitamin B12/Cyanocobalamine is only obtainable through animal sources, therefore strict vegetarians develop B12 deficiency. - Vit B12 deficiency leads to :- Megaloblastic anemia Peripheral neuritis SCDSC Infeility Atrophic glossitis Peripheral neuropathy.', 'role': 'assistant'}]