**Core Concept**
Anovulatory menstruation, also known as anovulatory cycle or functional hypothalamic amenorrhea, refers to a condition where ovulation does not occur due to a disruption in the normal menstrual cycle. This can be caused by various factors, including hormonal imbalances, stress, and certain medical conditions. The condition is characterized by irregular or absent menstrual bleeding.

**Why the Correct Answer is Right**
Anovulatory menstruation is often associated with irregular menstrual cycles, which can range from infrequent to frequent bleeding. The absence of ovulation leads to a lack of progesterone production, resulting in unopposed estrogen stimulation of the endometrium. This can cause irregular, heavy, or prolonged menstrual bleeding. The irregular bleeding patterns can be unpredictable and may not follow the typical 28-day menstrual cycle.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a correct feature of anovulatory menstruation, as irregular menstrual cycles are a hallmark of this condition.
**Option B:** This option is a correct feature of anovulatory menstruation, as the absence of ovulation leads to unopposed estrogen stimulation of the endometrium, causing irregular, heavy, or prolonged bleeding.
**Option C:** This option is a correct feature of anovulatory menstruation, as the condition is often associated with hormonal imbalances, including elevated levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

**Clinical Pearl / High-Yield Fact**
A key clinical feature of anovulatory menstruation is the presence of a polycystic ovary on ultrasound, which is associated with insulin resistance and hyperandrogenism. This is often seen in women with polycystic ovary syndrome (PCOS), a common cause of anovulatory menstruation.

**Correct Answer:** A.