question: A newborn begins vomiting after feeding, becomes severely jaundiced,and has liver disease. Treatment for possible sepsis
  is initiated, and the urine is found to have reducing substances. A blood screen for galactosemia is positive, and  lactose containing substances are removed from the diet. Lactose is toxic in this case because –
opa: Excess glucose accumulates in the blood
opb: Galactose is converted to the toxic substance galactitol (dulcitol)
opc: Galactose competes for glucose during hepatic glycogen synthesis
opd: Galactose is itself toxic in even small amounts