Which of the following are referred to as mononuclear phagocytes?

Which of the following are referred to as mononuclear phagocytes?
 
  A.
  Lymphocytes and basophils
 
  B.
  Mast cells and eosinophils
 
  C.
  Basophils and eosinophils
 
  D.
  Monocytes and macrophages

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The leukocyte responsible for adaptive immunity is the
 
  A. lymphocyte.
  B. monocyte.
  C. eosinophil.
  D. neutrophil.

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Allergic reactions mainly involve
 
  A. macrophages.
  B. monocytes.
  C. neutrophils.
  D. mast cells.

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The leukocyte that contains histamine is the
 
  A. lymphocyte.
  B. monocyte.
  C. macrophage.
  D. basophil.

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Which of the following is a phagocytic cell found in the human body?
 
  A.
  Erythrocyte
 
  B.
  Neutrophil
 
  C.
  Megakaryocyte
 
  D. T cell