Which region of the gastrointestinal tract represents its narrowest segment?

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60 centimeters before the ileocecal valveThe initial section of the duodenumThe junction between the esophagus and stomachThe junction between the pharynx and esophagus

Explanation

The narrowest portion of the gastrointestinal tract is at the pharyngo-esophageal junction. Other areas such as 60 cm proximal to the ileocecal junction, the first part of the duodenum, and the esophago-gastric junction are wider in comparison.