This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Surgery
[{'content': 'Which of the following is not done in carcinoma esophagus? \nSelect and explain. \nA. Biopsy, B. pH - metry/monitoring, C. CT chest, D. PET scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CARCINOMA ESOPHAGUS: Squamous cell carcinoma of esophagus usually affects the upper two thirds;whereas, adenocarcinoma usually affects lower third of esophagus. Tobacco, alcohol, GERD & Obesity are some of the common etiological features. Bad prognosis if lymph nodes are involved. The most common presenting symptom is Dysphagia. INVESTIGATIONS: 1st investigation - Barium Swallow IOC for Dx - Endoscopy with biopsy IOC for staging - EUS IOC for staging in cases of obstructed lumen/ advanced stage: CECT IOC for distant metastasis - PET Scan', 'role': 'assistant'}]