This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
What is the commonest site of esophageal carcinoma ? 
Select and explain. 
A. lower end of oesophagus, B. upper end of oesophagus, C. middle third of oesophagus, D. thorasic pa of oesophagus
A: lower end of oesophagus
Answer: A: lower end of oesophagus 
Explanation: The lower end of the oesophagus is also prone to inflammation or ulceration by regurgitation of acid from the stomach. It is the commonest site of oesophageal carcinoma. Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 2 , pg.no.,273.