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: Gynaecology & Obstetrics
Which of the following is not caused by Chlamydia trachomatis? 
Select and explain. 
A. Certis, B. Urethritis, C. Vulvitis, D. Epididymitis
C: Vulvitis
Answer: C: Vulvitis 
Explanation: Chlamydia doesn't cause vulvitis. PID is very common.