This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hyper Pigmented Disorders, Subject name: Dental
[{'content': 'True about incontinenta pigmenti includes the following except: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: INCONTINENTIA PIGMENTI X-linked dominant neurocutaneous syndrome with cutaneous, neurologic, ophthalmologic, and dental manifestations. Skin features occur in 4 stages Stage 1 (vesicular) Stage 2 (verrucous) Stage 3 (hyperpigmented) Stage 4 (atrophic/hypopigmented) Ophthalmologic findings Ophthalmologic findings occur in 20-35% of patients, and asymmetric involvement is common. Retinal vaso-occlusive events with resultant ischemia is primary mechanism in ocular pathology Treatment: Family counselling may prevent occurrence of new cases Skin lesions subside in adulthood spontaneously', 'role': 'assistant'}]