This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Non gonococcal urethritis is mostly caused by: 
Select and explain. 
A. Chlamydia and streptococcus, B. Chlamydia and ureaplasma, C. Chlamydia and treponema, D. Chlamydia and mycoplasma
B: Chlamydia and ureaplasma
Answer: B: Chlamydia and ureaplasma 
Explanation: Chlamydia and ureaplasma