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
M.C. site of Ca esophagus is ? 
Select and explain. 
A. Middle 1/3rd, B. Upper 1/3rd, C. Lower 1/3rd, D. Lower end of esophagus
C: Lower 1/3rd
Answer: C: Lower 1/3rd 
Explanation: Ans. is 'c' i.e., Lower 1/3rdDistribution of esophageal Ca (Harrison 17th/e p. 571)Upper 3rd - 10%Middle 3'd 35%Lower 3rd --> 55%