Tissue macrophage are differentlated from: a. B cells D b. T cells C. NK cells d. Monocytes

Tissue macrophages are differentiated from monocytes. Monocytes are a type of white blood cell that circulates in the bloodstream. When they migrate into tissues and become activated, they differentiate into macrophages. Macrophages are a type of immune cell that plays a crucial role in the body's defense system. They are responsible for engulfing and destroying foreign substances, such as bacteria and viruses, as well as dead cells and debris. Therefore, the correct answer is option d.