Cells of the mononuclear phagocyte system include
a) macrophages and monocytes.
b) neutrophils and eosinophils.
c) lymphocytes and plasma cells.
d) macrophages, monocytes, neutrophils and eosinophils.
e) macrophages, monocytes, neutrophils, eosinophils, lymphocytes
and plasma cells.

A) macrophages and monocytes.

Explanation:

Mononuclear phagocytes are an important part of cellular immune defenses. Monocytes (which are a part of mononuclear phagocytic system) are the large mononuclear cells found in red bone marrow and they are actively motile and phagocytic (they ingest bacteria), and develop into macrophages when they move to other tissues.

Macrophages  are a type of phagocyte that is responsible for detecting, engulfing and destroying pathogens, they are produced through the differentiation of monocytes

the answer to your question is (pancreas).