<prompt> Protein quality assessments is best done by -NPUBiological valueDigestibility coefficientAmino acid score  <response>: - the net protein utilisation is considered of more practical value for evaluation of protein because it is the product of biological value and digestibility coefficient divided by 100. - it is the propoion of ingested protein that is retained in the body under specified condition for the maintenance andor growth of the tissues. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:610 p 