This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: ENT
Schatzki's ring is present in - 
Select and explain. 
A. Upper end of esophagus, B. Mid-esophagus, C. Squamocolumnar junction in esophagus, D. Fundus of stomach
C: Squamocolumnar junction in esophagus
Answer: C: Squamocolumnar junction in esophagus 
Explanation: Ans. is 'c' i.e., Squamocolumnar junction in esophagus Schatzki's ringo It occurs at the junction of squamous and columnar epithelium at the lower end of oesophagus and has also been called lower oesophageal ring.o Usually seen in patients above 50 years of age.o Cause is unknown.o Symptomatic patients complain of intermittent dysphagia and some may even present with bolus obstructiono It may be associated with hiatus herniao Treatment is oesophageal dilatation.