**Core Concept**
Fibroids are benign tumors that arise from the smooth muscle layer of the uterus, and their growth can lead to various clinical presentations. The most common presentations include abnormal uterine bleeding, pelvic pressure or pain, and infertility.

**Why the Correct Answer is Right**
Amenorrhoea, or the absence of menstrual periods, is an uncommon presentation of fibroid uterus. This is because fibroids typically cause an increase in menstrual bleeding, rather than a decrease. Fibroids can distort the uterine cavity, leading to irregular or heavy menstrual bleeding, but they are less likely to cause amenorrhoea. In some cases, a large fibroid can compress the uterine cavity, leading to a decrease in menstrual flow, but this is still a rare occurrence.

**Why Each Wrong Option is Incorrect**
**Option A:** Infertility is a common presentation of fibroid uterus, particularly if the fibroids are intramural or submucosal. These types of fibroids can distort the uterine cavity, making it difficult for a fertilized egg to implant.
**Option C:** Pelvic mass is a common presentation of fibroid uterus, especially if the fibroids are large and multiple. Women with fibroids may experience a palpable mass in the pelvis.
**Option D:** Menorrhagia, or heavy menstrual bleeding, is a common presentation of fibroid uterus. Fibroids can increase menstrual bleeding by distorting the uterine cavity and increasing blood flow to the uterus.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that fibroids can have a significant impact on a woman's fertility, particularly if the fibroids are submucosal or intramural. Submucosal fibroids can distort the uterine cavity, making it difficult for a fertilized egg to implant, while intramural fibroids can reduce blood flow to the uterus, making it harder for an embryo to implant and develop.

✓ Correct Answer: B. Amenorrhoea