This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Frie's test is useful for diagnosis of - 
Select and explain. 
A. Mycoplasma, B. Rickettsia, C. Sarcoidosis, D. Chlamydia
D: Chlamydia
Answer: D: Chlamydia 
Explanation: 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.