<prompt> The function common to neutrophils, monocyte and macrophages is:Immune responsePhagocytosisLiberation of histamineDestruction of old erythrocytes  <response>: Ans. is b i.e., Phagocytosis Ref: Ananthanarayan, 9the, p. 137and 8the, p. 131 - 132 Monocytes and Macrophages originate from bone marrow and their main functions are phagocytosis and Ag presentation. 