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
Adrenocortical carcinoma of size 6cm without invading surrounding structure is classified as : 
Select and explain. 
A. Stage I Adrenocortical carcinoma, B. Stage II Adrenocortical carcinoma, C. Stage III Adrenocortical carcinoma, D. Stage IV Adrenocortical carcinoma
B: Stage II Adrenocortical carcinoma
Answer: B: Stage II Adrenocortical carcinoma 
Explanation: Mc Farlane classification of Adrenocortical tumour :

Stage I : < sem.
Stage II : > sem.
Stage III : Locally invasive tumour.
Stage IV : Destant metastasis.