**Core Concept**
Monochorionic monoamniotic twins arise from the division of a single fertilized egg (zygote) at a very early stage, resulting in two embryos that share the same placenta and amniotic sac. This condition is a type of monozygotic twinning, where the twins are genetically identical.

**Why the Correct Answer is Right**
When the division of the zygote occurs after the third day of fertilization, the two embryos will develop from the same placenta and amniotic sac, resulting in monochorionic monoamniotic twins. The shared placenta and amniotic sac increase the risk of complications, such as twin-to-twin transfusion syndrome and fetal entanglement.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the timing of zygote division in relation to monochorionic monoamniotic twinning.
* **Option B:** Bichorionic diamniotic twinning occurs when the division of the zygote occurs after the third day of fertilization, but the two embryos develop separate placentas and amniotic sacs.
* **Option C:** Monochorionic diamniotic twinning occurs when the division of the zygote occurs after the third day of fertilization, but the two embryos develop from the same placenta and separate amniotic sacs.

**Clinical Pearl / High-Yield Fact**
The risk of monochorionic monoamniotic twinning is increased in assisted reproductive technologies (ART) such as in vitro fertilization (IVF), and it is essential to monitor these pregnancies closely for potential complications.

**Correct Answer: C.**