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
[{'content': 'Deficiency of which of the following vitamin in most commonly seen in short bowel syndrome with ileal resection - \nSelect and explain. \nA. Vitamin B12(Cyanocobalamine), B. Vitamin B1 (Thiamine), C. Folic Acid, D. Vitamin K', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]