<prompt> The lacrimal duct open at theSuperior turbinateMiddle meatusInferior meatusNone of the above  <response>: Nasolacrimal duct is a membranous passage of 18mm long. It begins at the lower end of lacrimal sac, runs downwards, backward and laterally, and opens into the inferior meatus of nose. A fold of mucous membrane called the valve of Hasner forms an imperfect valve at the lower end of the duct. 