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': 'The stage of Ca Endometrium with Invasion of 10 mm of Myometrium is : \nSelect and explain. \nA. la, B. b, C. lib, D. lia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. lb', 'role': 'assistant'}]