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: Medicine
[{'content': 'In CCF there is - \nSelect and explain. \nA. Oliguria, B. Polyuria, C. Oliguria during day and polyuria during night, D. Anuria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]