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': 'Most Severe degree of alkalosis occurs in obstruction of - \nSelect and explain. \nA. Cardiac end, B. Pylorus, C. Ileocaecal region, D. Colon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • Gastric alkalosis is most marked with vomiting due to pyloric stenosis or obstruction because the vomitus is acidic gastric juice only.\n• Vomiting in other conditions may involve a mixture of acid gastric loss and alkaline duodenal contents\xa0and the acid-base situation that results is more variable.\n• Loss of alkaline small intestinal contents can even result in an acidosis if gastric acid secretion is suppressed.', 'role': 'assistant'}]