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: Surgery
Most common nutritional deficiency seen after gastrectomy 
Select and explain. 
A. Iron deficiency, B. B12 deficiency, C. Vitamin d deficiency, D. Vitamin k deficiency
A: Iron deficiency
Answer: A: Iron deficiency 
Explanation: Most common complication is violin deficiency.