This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Surgery
In which case immunoguided surgery is done? 
Select and explain. 
A. CA colon, B. CA pancreas, C. CA jejunum, D. CA anal canal
A: CA colon
Answer: A: CA colon 
Explanation: Radio-immunoguided surgery procedureinwhichradiolabeledsubstancesareadministeredandtumorsareexcisedbasedonthelocationofradioactivesignals Radio-immunoguided surgery for colorectal cancer The intra-operative detection of metastatic disease in colorectal cancer depends on tumor associated antigen and antibodies as well as detection technology.