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': 'Water loss is severe if intestinal obstruction occurs at- \nSelect and explain. \nA. First part of duodenum, B. Third part of duodenum, C. Midjejunum, D. Ileum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In high small bowel obstruction there is rapid vomiting and dehydration.', 'role': 'assistant'}]