This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
Following is true of T. pallidum except - 
Select and explain. 
A. Can be maintained in rabbit testis, B. Motile by peritrichate flagella, C. To visualise, dark ground microscopy is used, D. TPI test is very-useful
B: Motile by peritrichate flagella
Answer: B: Motile by peritrichate flagella 
Explanation: Option 1 Culture: - Pathogenic treponemes cannot be grown in aificial culture media but are maintained rabbit testes. - However, nonpathogenic treponemes (e.g. Reiter treponemes) can be cultured in Smith Noguchi media Option 2 - It is actively motile. Endoflagella are responsible for motility of the bacteria. Option 3 Direct Microscopy: - Dark field microscopy - Direct IF staining from sample (DFA-TP) - Silver impregnation method Option 4 - TPI : Specific Treponemal test for diagnosis of Syphilis.