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 has undergone a Cholecystectomy. The histopathology reveals that she has a 3 cm adenocarcinoma in the body of the gallbladder infiltrating upto the serosa. Which of the following further management would you advise her - 
Select and explain. 
A. Chemotherapy, B. Radiotherapy, C. Radical Chlolecystectomy, D. Follow up with regular ultrasound examinations
C: Radical Chlolecystectomy
Answer: C: Radical Chlolecystectomy 
Explanation: None