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
[{'content': 'In 1st week of parenteral nutrition, patient becomes: March 2013 (f) \nSelect and explain. \nA. Overweight, B. Underweight, C. Normal weight, D. Variable', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Underweight Total parenteral nutrition TPN is used as a primary therapy in: - Severe burns, - Sho bowel syndrome etc. Complications of TPN: - Air embolism, - Weight loss in 7 days etc. Metabolic changes in TPN: - Essential fatty acid deficiency, - Electrolyte disorder etc.', 'role': 'assistant'}]