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
A 40 year old woman undergoing laproscopic cholecystectomy is found to have a mass suspicious of cancer of gall bladder. It appears to have permeated through the entire thickness but there is no involvement of overlying serosa. The next surgical step would be 
Select and explain. 
A. Continue simple cholecystectomy, B. Extended cholecystectomy, C. Palliative radiotherapy, D. Radiofrequency Ablation
B: Extended cholecystectomy
Answer: B: Extended cholecystectomy 
Explanation: Answer- B. Extended cholecystectomyThe tumor described is in stage T2- Extended cholecystectomy is advised.