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': 'Most common site for carcinoma cervix is : \nSelect and explain. \nA. Endocervix, B. Ectocervix, C. Near the internal os, D. Vault', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ectocervix', 'role': 'assistant'}]