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 an example of dysfunctional uterine bleeding : 
Select and explain. 
A. Hypothyroidsm, B. PID, C. Cervical erosion, D. None
D: None
Answer: D: None 
Explanation: None