<prompt> Constrictions in Esophagus by aoa is present at distance of from incisor15 cm25cm30 cm40 cm  <response>: Construction of oesophagus at the following levels 15 cm-crossed by cricopharyngeus 22.5 cm-crossed by aoa 27.5 cm-crossed by left bronchus 37.5 cm-pierces the diaphragm All from incisor teeth BD CHAURASIAS HUMAN ANATOMY VOL.1,PAGE NO 282 