A 3-Year-Old Boy Experiences Recurrent Sinusitis and an Episode of Severe

A 3-year-old boy experiences recurrent sinusitis and an episode of severe pneumonia.  As part of his evaluation, Candida extract is injected intradermally.  Forty-eight hours later, he returns to the clinic with a firm nodule measuring 16 mm in diameter where the extract was injected.  Which of the following cell types is most likely responsible for the reaction observed in this patient?

A) B lymphocytes
B) Eosinophils
C) Mast cells
D) Neutrophils
E) T lymphocytes

Correct Answer:

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