A 23-year-old woman was given an intradermal injection of purified protein derivative of tubercle bacilli (PPD) as part of the yearly testing for tuberculosis. A positive reaction was elicited. Which cells secrete the cytokines needed for the formation of granulomas at the site of injection?
A) Keratinocytes
B) Melanocytes
C) B lymphocytes
D) TH1 cells
E) TH2 cells
Correct Answer:
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