Which of the following is a true statement regarding Purified Protine Derivative (PPD) used in tuberculin test?

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Gopal Sharma

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📊 Microbiology

Q. Which of the following is a true statement regarding Purified Protine Derivative (PPD) used in tuberculin test?

(A) Prepared from tubercle bacilli
(B) It is inferior to old tuberculin
(C) Consists of filtrate of glycerol broth
(D) None of these

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✅ Correct Answer: (A) Prepared from tubercle bacilli

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