**Core Concept**
Spontaneous labour initiation after foetal death is influenced by the release of various hormones and the maintenance of uterine quiescence. The underlying principle being tested is the physiological mechanism that regulates uterine activity and the role of hormones in labour initiation.

**Why the Correct Answer is Right**
Foetal death leads to the release of prostaglandins and other substances that stimulate uterine contractions. However, the maintenance of uterine quiescence is primarily mediated by the presence of the foetus. The placenta, which is the source of foetal hormones, continues to produce progesterone, which inhibits uterine contractions. After foetal death, the placenta undergoes degeneration, and the levels of progesterone decrease, allowing prostaglandins to stimulate uterine contractions. Typically, spontaneous labour begins within 2-4 weeks after foetal death due to this process.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as the time frame for spontaneous labour initiation after foetal death is typically longer than one week.
* **Option B:** This option is incorrect as the exact time frame for spontaneous labour initiation can vary depending on several factors, including the gestational age and the presence of any underlying medical conditions.
* **Option C:** This option is incorrect as the time frame for spontaneous labour initiation after foetal death is typically longer than one day.

**Clinical Pearl / High-Yield Fact**
Foetal death can lead to spontaneous labour initiation due to the release of prostaglandins and the decrease in progesterone levels, but the exact time frame can vary depending on individual factors.

**Correct Answer:** D