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: Physiology
[{'content': 'A decrease in the urine output is called: \nSelect and explain. \nA. Dysuria, B. Nocturia, C. Oliguria, D. Polyuria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]