In an inflammatory response, macrophages are usually derived from -: (A) Monocytes, (B) Reticuloendothelial cells, (C) Neutrophils, (D) Lymphocytes
Answer is A. When a monocyte enters damaged tissue through the endothelium of a blood vessel, a process known as the leukocyte extravasation, it undergoes a series of changes to become a macrophage. Reff: Ananthanarayanan & Panikers textbook of microbiology 9th edition pg: 137