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 pyelonephritis the diagnostic urinary finidng is - \nSelect and explain. \nA. Pus cell cast, B. RBC cast, C. Pus cells, D. RBCs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]