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: Medicine
Most common site for squamous cell carcinoma esophagus is: 
Select and explain. 
A. Upper third, B. Middle third, C. Lower third, D. Gastro-esophageal junction
B: Middle third
Answer: B: Middle third 
Explanation: Answer is B (Middle 1/3rd) The most common site of squamous cell carcinoma of esophagus is middle 1/3rd. Site of squamous cell carcinoma Percentage of total Upper 1/3rd 20% Middle 1/3rd 50% Lower 1/3rd 30%