**Core Concept**
A cervical fibroid, also known as a submucosal fibroid when located in the anterior wall of the cervix, can cause various symptoms due to its size, location, and potential to disrupt normal cervical function. The anterior wall of the cervix is the front portion, which can cause symptoms related to the uterine cavity and the external cervical os.

**Why the Correct Answer is Right**
The most common presentation of an anterior wall cervical fibroid is a **postmenopausal bleeding**. This is because the fibroid can grow into the uterine cavity, causing the endometrium to become polypoid and irregular, leading to irregular and sometimes heavy bleeding. The bleeding can be spontaneous and may not be related to the menstrual cycle, which is why it is more common in postmenopausal women.

**Why Each Wrong Option is Incorrect**
**Option A:** Dyspareunia (painful intercourse) can occur if the fibroid is large enough to cause cervical stenosis or if it is located in the posterior wall of the cervix, but it is not the most common presentation.
**Option B:** Pelvic pressure or discomfort can be caused by a variety of factors, including fibroids, but it is not specific to anterior wall cervical fibroids.
**Option C:** Menorrhagia (heavy menstrual bleeding) can be caused by fibroids located in the uterine wall or the endometrium, but it is not the most common presentation of an anterior wall cervical fibroid.

**Clinical Pearl / High-Yield Fact**
When evaluating a postmenopausal woman with bleeding, it is essential to consider the possibility of an anterior wall cervical fibroid, as it can be a cause of irregular and sometimes heavy bleeding.

**Correct Answer: D. Postmenopausal bleeding**