<prompt> Which enzyme is used to convert phenylalanine to tyrosine:Tyrosine synthaseTyrosine hydroxylasePhenylalanine hydroxylasePhenyl ethanolamine methyltransferase  <response>: Ans. c Phenylalanine hydroxylaseRef: Harpers Biochemistry, 30th ed. pg. 509-510 Phenylalanine hydroxylase: for conversion of Phenylalanine to tyrosine conversion Tyrosine hydroxylase: for conversion of tyrosine to L-Dopa Phenyl ethanolamine-N-methyltransferase: for conversion of norepinephrine to epinephrine 