Multiple Choice
What is the antigen used in the purified protein derivative (PPD) skin test?
A) A purified protein from the nucleus of Mycobacterium tuberculosis
B) A purified piece of DNA from M. tuberculosis
C) A purified protein from the cell wall of M. tuberculosis
D) A piece of ribosomal RNA from M. tuberculosis
Correct Answer:
Verified
Correct Answer:
Verified
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