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: ENT
A coin is struck at 25 cm from incisor in the esophagus, this place coincides with- 
Select and explain. 
A. Cricopharyngeal junction, B. Bronchial bifurcation, C. Aortic arch, D. Oesophago-gastric junction
C: Aortic arch
Answer: C: Aortic arch 
Explanation: Esophagus shows three normal constriction which are narrower portions of esophagus and foreign body can be held there.
These constrictions are : -


At pharyngo-esophageal junction (C6) - 15 cm from the upper incisors.
At crossing of arch of aorta and left main bronchus (T4) - 25 cm from upper incisors.
Where it pierces the diaphragm (T10) - 40 cm from upper incisors.