<prompt> Retinitis pigmentosa is a feature of all except:Refsums diseaseHallervorden-Spatz diseaseNARPAbetalipoproteinemia  <response>: Now Hallervorden Spatz doesnt have RP as a feature. Remember RP associations by mnemonic LUCHR. Lawrence moon Beidel syndrome Usher Cockayne Hallgren Refsum Other associations: NARP, Abetalipoproteinemia 