What is the correct definition of Mittelschmerz?

C The regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. B A female reproductive organ in which ova or eggs are produced. D One-sided, lower belly pain associated with normal ovulation. Usually occurs about 14 days before the next menstrual period. A A phase of the female menstrual cycle that involves the release of an egg (ovum) from one of the ovaries.