question: Q:A 6-month-old child is brought to the pediatrician by his parents for difficulty feeding and poor motor function. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all developmental milestones until 2 months ago. He started having trouble latching onto his bottle. He has also become extremely lethargic. Examination reveals diminished muscle tone in all four limbs, areflexia, and hepatosplenomegaly. A ophthalmoscopic exam reveals macular cherry red spots. Which of the following is most likely deficient in this child?? 
  {'A': 'ß-Glucosidase', 'B': 'Hexosaminidase A', 'C': 'Arylsulfatase A', 'D': 'Ceramidase', 'E': 'Sphingomyelinase'},