This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Which one of the following stromal dystrophy is a recessive condition ? 
Select and explain. 
A. Lattice dystrophy, B. Granular dystrophy, C. Macular dystrophy, D. Fleck dystrophy
C: Macular dystrophy
Answer: C: Macular dystrophy 
Explanation: It is an autosomal recessive dystrophy characterised by appearance of dense grey opacity in the central cornea. The condition results due to accumulation of mucopolysaccharides owing to a local enzyme deficiency. It occurs in childhood (5 to 10 years) and leads to marked defective vision in early life, which usually requires penetrating keratoplasty.Reference:Comprehensive ophthalmology,AK Khurana,4th edition,page no.