This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
wit B12 is found maximum in? 
Select and explain. 
A. Animal products, B. Green leafy vegetables, C. Roots and tubers, D. All
A: Animal products
Answer: A: Animal products 
Explanation: ref : lipincott