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': 'Antral obstruction with vomiting is NOT characterised by: \nSelect and explain. \nA. Hypokalemia, B. Hypochloremia, C. Acidosis, D. Hyponatremia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Repeated vomiting leads to hypochloremic, hypokalemic metabolic alkalosis. Acidosis is not seen. Ref: Schwaz 9/e, Page 1426; Nelson 17/e, Page 1229.', 'role': 'assistant'}]