At which anatomical level does the esophagus begin?

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At the lower border of the cricoid cartilageAt the level of the fifth cervical vertebra (C5)Approximately 10 centimeters from the incisor teethAt the seventh cervical vertebra (C7)

Explanation

The esophagus starts at the lower margin of the cricoid cartilage, which corresponds to the level of the sixth cervical vertebra (C6). Although other options mention nearby vertebral levels or distances, the correct anatomical starting point is the lower end of the cricoid cartilage.