This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
Metachromatic leukodystrophy is due to deficiency of 
Select and explain. 
A. Hexosaminidase A, B. Hexosaminidase B, C. Ceramidase, D. Arylsulfatase
D: Arylsulfatase
Answer: D: Arylsulfatase 
Explanation: DiseaseEnzyme deficiencySymptomsMetachromaticleukodystrophyArylsulfatase AMental retardation and psychologic disturbances in adults; demyelinationRef: Harper&;s Biochemistry; 30th edition; Chapter 24 Metabolism of Acylglycerols & Sphingolipids