This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mendalian Inheritance, Subject name: Biochemistry
All the following are mitochondrial disorders EXCEPT : 
Select and explain. 
A. MELAS, B. Kearns Sayre syndrome, C. NARP syndrome, D. Incontinentia pigmenti
D: Incontinentia pigmenti
Answer: D: Incontinentia pigmenti 
Explanation: Mitochondrial DNA disorders MELAS- Mitochondrial Encephalopathy, Lactic Acidosis and Stroke-like episodes Leigh syndrome Leber hereditary optic neuropathy Kearns Sayre syndrome NARP syndrome - Neuropathy, Ataxia & Retinitis Pigmentosa MERRF - Myoclonic epilepsy with ragged-red fibers Whereas Incontinentia pigmenti (Bloch-Sulzberger syndrome) X-linked genetic disease Skin, hair, teeth & CNS manifestations