**Core Concept**
The induction of labor is a medical intervention aimed at stimulating uterine contractions to initiate or accelerate the process of labor. However, certain conditions may increase the risk of complications or render the procedure unsafe. Understanding the contraindications of induction of labor is crucial for obstetricians to make informed decisions.

**Why the Correct Answer is Right**
The correct answer is **Placenta previa**. Placenta previa is a condition where the placenta partially or completely covers the internal cervical os. Induction of labor in such cases can lead to severe bleeding, as the placenta may separate from the uterus during contractions. The risk of hemorrhage is high due to the placenta's proximity to the cervix, making it a contraindication for induction of labor.

**Why Each Wrong Option is Incorrect**
* **Option A:** Post-term pregnancy is not a contraindication for induction of labor. In fact, induction is often recommended for post-term pregnancies to reduce the risk of fetal distress and other complications.
* **Option B:** Multiple pregnancy (twins, triplets, etc.) is not a contraindication for induction of labor. However, the decision to induce labor may depend on various factors, including the gestational age and fetal well-being.
* **Option C:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that placenta previa is a medical emergency that requires prompt attention. A diagnosis of placenta previa should be confirmed through ultrasound examination, and the patient should be managed in a hospital setting with ready access to blood transfusion services.

**Correct Answer: C. Placenta previa.