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': 'Which is false regarding Ureteric stones -a) Urine is always infectedb) Should be removed immediatelyc) Source is always the kidneysd) Pain is referred to tip of penis in intramural stones \nSelect and explain. \nA. ac, B. a, C. ab, D. bc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]