<prompt> Rate limiting enzyme in catecholamine biosynthesis isTyrosine hydroxylaseDopa DecarboxylaseDopamine beta-hydroxylase DBHPhenylethanolamine-N-Methyltransferase PNMT  <response>: Tyrosine Hydroxylase Is Rate-Limiting for Catecholamine BiosynthesisRef: Harper;s Biochemistry; 30th edition; Chapter 41; The Diversity of the Endocrine System 