<prompt> Acquired nasolacrimal duct obstruction is a side effect of therapy of which of the following medication?TimololBrimonidineDorzolamidePilocarpine  <response>: Ans. a. Timolol Ref: Seider N, Miller B, Beiran l. Topical glaucoma therapy as a risk factor for nasolacrimal duct obstruction. Am J Ophthalmol. 2008 Jan; 1451: 120-123, Epub 2007 Oct 29.Acquired nasolacrimal duct obstruction is a side effect of chronic use of timolol-containing topical glaucoma therapy:Chronic use of timolol-containing topical glaucoma therapy preparations in glaucoma patients is associated with an increased risk for the development of nasolacrimal duct obstruction NLDO.- Seider N, Miller B, Beiran I. Topical glaucoma therapy as a risk factor for nasolacrimal duct obstruction. Am J Ophthalmol. 2008 Jan;1451:120-123. Epub 2007 Oct 29. 