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: Biochemistry
Which of these is a water soluble vitamin? 
Select and explain. 
A. Vitamin A, B. Vitamin B12, C. Vitamin D, D. Vitamin E
B: Vitamin B12
Answer: B: Vitamin B12 
Explanation: None