<prompt> Most common cause of DUB is?AnovulatoryOvulatoryCoagulapathyPregnancy related  <response>: ANSWER: A AnovulatoryREF: Novaks Gynaecology 14th ed page 461DUB is the term used to describe abnormal uterine bleeding for which no specific cause has been found.It most often implies a mechanism of anovulation. Most anovulatory bleeding is a result of estrogen breakthrough.It is a diagnosis of exclusion. 