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
Common type of Ca in middle '/3rd of oesophagus? 
Select and explain. 
A. Adeno Ca, B. Squamous Ca, C. Adeno squamous Ca, D. Leiomyosarcoma
B: Squamous Ca
Answer: B: Squamous Ca 
Explanation: 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.