This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malabsorbtion Syndrome, Subject name: Medicine
B-ring in oesophagus is found at? 
Select and explain. 
A. Junction of cervical esophagus and cricopharyngeus, B. Gastro-esophageal junction, C. Junction of upper 1/3rd and middle 1/3rd of esophagus, D. Junction of cricopharyngeus and upper 1/3rd of esophagus
B: Gastro-esophageal junction
Answer: B: Gastro-esophageal junction 
Explanation: B- ring - Schatzki ring * Lower 1/3rd esophageal mostly at the Gastro - esophageal junction * LE Ring < 13mm * Aphagia/ Food impaction