This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Esophageal disorders, Subject name: Pathology
[{'content': 'A 60 year-old have prolonged history of tobacco chewing presented with symptoms of weight loss and dysphagia. Esophageal biopsy was taken from a projectile mass in the esophagus which is shown below. What is your likely diagnosis? \nSelect and explain. \nA. Adenocarcinoma, B. Carcinoid tumor, C. Squamous cell carcinoma, D. Small cell cancer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Esophageal biopsy shows Keratin pearls which is suggestive of squamous cell carcinoma. - MC esophageal carcinoma in india - Squamous cell carcinoma. - MC location of SCC - middle 1/3rd of esophagus Endoscopy showing Squamous cell carcinoma of esophagus Barium swallow showing apple core appearance of Squamous cell carcinoma of esophagus EXTRA EDGE: - MC esophageal cancer in developed countries like USA - Adenocarcinoma - MC location of adenocarcinoma - Lower 1/3rd of esophagus', 'role': 'assistant'}]