<prompt> Which of the following is an antagonist of a peptide and is used to reduce chemotherapy induced nausea and vomiting?Atrial natriuretic peptideAprepitantBradykininEnalapril  <response>: This drug is an antagonist of substance p.it is paicularly useful in delayed phase of chemotherapy induced vomiting.ref Goodman and Gilman 11e p1005 