<prompt> Constrictions in esophagus are present at distance of from incisor -a 12 cmb 25 cmc 28 cmd 36 cme 40 cmacOnly bbeae  <response>: There are 4 esophageal constrictions. They are at 15cms, 22.5cms, 27.5cms and 37.5 to 40 cms, from the incisors. 