challenge: What is the systematic name of the enzyme Tryptophan N-monooxygenase?
  
  A. L-tryptophan,NADPH:oxygen oxidoreductase (N-hydroxylating)
  B. L-tryptophan,NADH:oxygen oxidoreductase (N-hydroxylating)
  C. L-tryptophan,FAD:oxygen oxidoreductase (N-hydroxylating)
  D. L-tryptophan,NADP+:oxygen oxidoreductase (N-hydroxylating)
  Answer: 