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
All are true about retinitis pigmentosa EXCEPT – 
Select and explain. 
A. Genetic inheritance (X–linked), B. Early diagnosis and treatment, C. Visual acuity not diminished till late in course, D. Associated with systemic abnormalities
B: Early diagnosis and treatment
Answer: B: Early diagnosis and treatment 
Explanation: Treatment is eminently unsatisfactory since nothing appears to have a decided influence upon the course of the disease.
Retinitis pigmentosa shows all three pattern of inheritance, i.e., autosomal recessive (most common), autosomal dominant, sex- linked (X- linked recessive).
Initially there is loss of peripheral vision and central vision is preserved till late.
Retinitis pigmentosa is assoicated with many systemic syndromes.