Frie's test is useful for diagnosis of -: (A) Mycoplasma, (B) Rickettsia, (C) Sarcoidosis, (D) Chlamydia
Answer is D. Ans. is 'd' i.e., Chlamydiao Fries test (skin hypersensitivity test) was used for LGV (caused by chlamydia trachomatis),o But it is not used nowr because of high false positive results.