<prompt> Which of the following enzymes require Vitamin C for their activity?Procollagen proline hydroxylaseProcollagen amino peptidaseProcollagen carboxyl peptidaseLysyl oxidase  <response>: Vitamin C plays the role of a coenzyme in hydroxylation of proline and lysine while protocollagen is converted to collagen i.e. post-translational modification. The hydroxylation reaction is catalysed by lysyl hydroxylase for lysine and prolyl hydroxylase for proline. 