This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
[{'content': 'T-staging of esophagus is best done by - \nSelect and explain. \nA. EUS, B. CT, C. MRI, D. PET', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) EUSRef Sabiston 20th Edition, Page 1027-1035* IOC for diagnosis: Endoscopic biopsy* IOC for T Staging: EUS* IOC for N staging: EUS* IOC to assess Metastasis: CECT chest and abdomen', 'role': 'assistant'}]