<prompt> A coin is struck at 25 cm from incisor in the esophagus, this place coincides with-Cricopharyngeal junctionBronchial bifurcationAortic archOesophago-gastric junction  <response>: 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. 