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 vomitting is Not Characterised by - \nSelect and explain. \nA. Hypokalemia, B. Hypochloremia, C. Acidosis, D. Hyponatremia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]