**Core Concept**
Spasmodic dysmenorrhoea is a type of primary dysmenorrhoea characterized by painful menstrual cramps due to uterine contractions. This condition is often associated with a normal menstrual cycle and pelvic anatomy.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of spasmodic dysmenorrhoea, which involves the release of prostaglandins from the endometrium. Prostaglandins stimulate the myometrium to contract, leading to painful uterine spasms. This condition is often seen in women with a normal menstrual cycle and pelvic anatomy, without any underlying anatomical or pathological abnormalities.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the type of dysmenorrhoea. While endometriosis is associated with dysmenorrhoea, it is a different condition characterized by abnormal endometrial tissue outside the uterus.
**Option B:** This option is incorrect because it refers to a condition characterized by abnormal uterine anatomy, such as a bicornuate uterus, which is not directly related to spasmodic dysmenorrhoea.
**Option C:** This option is incorrect because it refers to a condition characterized by abnormal pelvic anatomy, such as a uterine fibroid, which is not directly related to spasmodic dysmenorrhoea.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that spasmodic dysmenorrhoea is often seen in women with a normal menstrual cycle and pelvic anatomy, without any underlying anatomical or pathological abnormalities.

**Correct Answer:** D.