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: Anatomy
Distance of the Lower Esophageal Sphincter from the upper incisors is - 
Select and explain. 
A. 15cm, B. 22.5cm, C. 27.5cm, D. 37.5cm
D: 37.5cm
Answer: D: 37.5cm 
Explanation: There are 4 esophageal constrictions. They are at 15cms, 22.5cms, 27.5cms and 37.5 to 40 cms, from the incisors. The fourth constriction is when the esophagus pierces the diaphragm, and here the lower esophageal sphincter is there.