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: Gynaecology & Obstetrics
[{'content': 'Carcinoma cervix la1 is : \nSelect and explain. \nA. < 3 mm depth, B. < 7 mm depth, C. > 3 mm depth, D. > 7 mm depth', 'role': 'user'}, {'content': 'Answer: A \nExplanation: < 3 mm depth', 'role': 'assistant'}]