This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large intestine, Subject name: Surgery
[{'content': 'In colorectal cancer, tumor deposits in subserosa without regional lymph node metastasis. According to 8th AJCC, stage the tumor: \nSelect and explain. \nA. T4b, B. N2b, C. N1c, D. M1c', 'role': 'user'}, {'content': 'Answer: C \nExplanation: According to 8th AJCC, tumor deposits in subserosa without regional lymph node metastasis is stage N1c', 'role': 'assistant'}]