This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Dacrocystorhinostomy, where the duct is opened? 
Select and explain. 
A. Superior meatus, B. Inferior meatus, C. Middle meatus, D. Sphenoethmoidal recess
C: Middle meatus
Answer: C: Middle meatus 
Explanation: Ans. is 'None > c' i.e., Vitreous hemorrhage CMV retinitis is the most common ophthalmic manifestation of CMV, occuring as a congenital infection in infants or an oppounistic infection in the immunocompromised host. Adults commonly affected include those individuals with acquired immunodeficiency syndrome (AIDS), oncology patients, and patients on immunosuppresive therapy. There is characteristic hemorrhagic, full thickness retinitis. In early stage there are yellow-white exudates (areas of retinal necrosis) associated with areas of vasculitis and retinal hemorrhage. There may be exudative retinal detachment and ultimately, there occurs total retinal atrophy. There are three distinct variants of CMV retinitis :? 1. Classical (fulminant) retinitis It is necrotic retinitis Large areas of retinal hemorrhage along a whitened, edematous or necrotic retina, usually in posterior pole in the distribution of nerve fiber layer along the vascular arcades. It is also known as "Pizza-Pic retinopathy" or "cottage cheese with catchup". 2. Granular (indolent) retinitis Without edema, hemorrhage or vascular sheathing, progressing along active border of retinal periphery. 3. Perivascular retinitis Frosted branch angitis with retinal perivasculitis. Another finding in CMV retinitis is a white granular geographic lesion that clears centrally as it enlarges, leaving a quiet central area of retinal atrophy and mottled pigment epithelium. This has also been described as "brush-fire"pattern. It should be remembered that vitreous hemorrhage, though, is not common in CMV retinitis, it may occur after initiation of treatment of AIDS (HAA). In routine course there is no vireous hemorrhage or vitritis due to immunocompromised state of these patients. But, once the treatment of AIDS is staed, their immune status may improve, and capable of producing inflammation. Which may cause vitritis and vitreous hemorrhage.