This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "Common type of Ca in middle '/3rd of oesophagus? \nSelect and explain. \nA. Adeno Ca, B. Squamous Ca, C. Adeno squamous Ca, D. Leiomyosarcoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Squamous cell carcinomaEsophageal carcinoma is of two common histological types -1.Squamous cell carcinomao Most common type world wide. o Most common type in India.o Occurs in upper and middle 1/3"\' of esophagus.2. Adenocarcinomao Most common type in USA.o Located in the lower \'/3rd of esophagus.', 'role': 'assistant'}]