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 distal to 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. Although options B, C, and D mention nearby anatomical landmarks, the correct starting point is the lower end of the cricoid.