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 level of the seventh cervical vertebra (C7)

Explanation

The esophagus starts at the lower border of the cricoid cartilage, which corresponds to the level of the C6 vertebra. The other options refer to different anatomical landmarks that do not mark the beginning of the esophagus.