This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Pathology
M.C. site of Ca esophagus is 
Select and explain. 
A. Middle 1/3 rd, B. Upper 1/3 rd, C. Lower 1/3rd, D. Lower end of esophagus
C: Lower 1/3rd
Answer: C: Lower 1/3rd 
Explanation: tumors of oesophagus usually occurs in distal third of oesophagus and may invade gastric cardia ROBBINS TEXT BOOK OF PATHOLOGY 9TH EDITION PD NO.662