The Immune Response in a Healthy 12-Year-Old Boy Is Observed

The immune response in a healthy 12-year-old boy is observed after a recurrent bacterial infection.  It is characterized by a rapid increase in pathogen-specific immunoglobulin levels.  The immunoglobulins bound to the bacteria also attach to phagocytic cells (eg, macrophages, neutrophils) to enhance phagocytosis.  Which of the following immunoglobulin regions is most likely involved in interacting with these phagocytic cells?

A) Constant region of the heavy chain
B) Constant region of the light chain
C) Hinge region
D) Variable region of the heavy chain
E) Variable region of the light chain

Correct Answer:

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