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: Medicine
Generalised edema can be produced by deficiency of- 
Select and explain. 
A. Vit. A, B. Thiamine, C. Vit. D, D. Folic acid
B: Thiamine
Answer: B: Thiamine 
Explanation: None