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 pa of duodenum, B. Third pa of duodenum, C. Mid jejunum, D. Ileum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In high small bowel obstruction there is rapid vomiting and dehydration. Ref: Bailey & Love 25/e, Page 1193.', 'role': 'assistant'}]