This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Biochemistry
[{'content': 'Vitamin B12 is found maixmum in: \nSelect and explain. \nA. Animal products, B. Green leafy vegetables, C. Roots and tubers, D. Sunlight', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin B12 Synthesized exclusively by microbes. Dietary sourceis exclusively ofanimal origin Vitamin B12deficiency clinical manifestations: Haematological: Megaloblastic anemia, Hypersegmentation of neutrophils. Neurological: Demyelination in peripheral nerves and spinal cord', 'role': 'assistant'}]