<prompt> Most common cause of obstruction in atrophic rhinitis is:Excessive formation of crustPolypSynechiaeHypertrophy of turbinate  <response>: a Excessive formation of crustRef. Cummings, 6th ed., 695The excessive crusting leads to nasal obstruction in spite of roomy cavities.On removal of crusts there is bleeding. But there is no synechiae formation. There is no polypoidal change . 