Where is the Valve of Hasner located?

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At the opening of Stensen's ductWithin the common bile ductAt the distal end of the nasolacrimal ductInside the maxillary sinusNone of the above

Explanation

The Valve of Hasner is a mucosal fold situated at the lower end of the nasolacrimal duct, preventing backflow of tears into the nasal cavity. It is not associated with Stensen's duct, the common bile duct, or the maxillary sinus.