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': 'Adrenocortical carcinoma of size 6cm without invading surrounding structure is classified as : \nSelect and explain. \nA. Stage I Adrenocortical carcinoma, B. Stage II Adrenocortical carcinoma, C. Stage III Adrenocortical carcinoma, D. Stage IV Adrenocortical carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mc Farlane classification of Adrenocortical tumour :\n\nStage I : < sem.\nStage II : > sem.\nStage III : Locally invasive tumour.\nStage IV : Destant metastasis.', 'role': 'assistant'}]