This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
Deficiency of which of the following vitamin is most commonly seen in short bowel syndrome with ileal resection: 
Select and explain. 
A. Vitamin B12, B. Vitamin B1, C. Folic acid, D. Vitamin K
A: Vitamin B12
Answer: A: Vitamin B12 
Explanation: Ans. (a) Vitamin B12* Deficiencies in SBS:# Bile salt malabsorption# B12 deficiency (Most common)# Fat soluble vitamin deficiency# Steatorrhea (Fat loss)