<prompt> Sphingomyelinase deficiency is characteristic of?Fabrys diseaseKrabbes diseaseTay Sachs diseaseNiemann Pick disease  <response>: Ans. D. Niemann Pick diseaseSphingomyelinase deficiency is seen in Niemann Pick disease. The enzymes deficient in the other disease are:a. Fabry disease - alpha galactosidaseb. Krabbes disease - beta galactosidasec. Tay Sachs disease - Hexosaminidase A 