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
[{'content': 'In which case immunoguided surgery is done? \nSelect and explain. \nA. CA colon, B. CA pancreas, C. CA jejunum, D. CA anal canal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]