Anatomy Nose 6739e140 Location Hasner's of valve- A Opening of nasolacrimal duct B Sphenoidal sinus opening C Frontal sinus opening D Ethmoidal sinus opening High-Yield Explanation Ans, is 'a' i.e., Opening of nasolacrimal duct o Nasolacrimal duct opens into inferior meatus and is closed by a mucosal flap called Hasner's valve.