<prompt> Halban disease is due toPersistent corpus luteumDeficient corpus luteumPersistent trophoblastDeficient trophoblast  <response>: Irregular shedding Halbans diseaseIt is rare and self-limited. It is due to persistent corpusluteum. The menstruation comes on time, is prolonged but not heavy. Progestogen can suppress the bleeding, but needs to be taken on tapering dose for 20 days to complete the cycle. 