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: Dental
True about incontinenta pigmenti include the following except – 
Select and explain. 
A. X-linked dominant, B. Primary skin abnormality, C. Avascularity of peripheral retina, D. Ocular involvement is seen in almost 100% cases and is typically unilateral
D: Ocular involvement is seen in almost 100% cases and is typically unilateral
Answer: D: Ocular involvement is seen in almost 100% cases and is typically unilateral 
Explanation: Ocular involvement occurs in 20-35% of cases. Involvement is assynzetrical. The two pathognomic changes are -


Retinal pigmentary changes with mottled diffuse hypopigmentation.
Abnormal peripheral retinal vessels with areas of non perfusion (a vascularity).