**Core Concept**
The oxytocin challenge test (OCT) is a non-stress test used to assess fetal well-being by monitoring the fetal heart rate response to maternal intravenous infusion of oxytocin. This test evaluates the fetal autonomic nervous system's ability to respond to stress.

**Why the Correct Answer is Right**
Oxytocin increases uterine contractions, which can stress the fetus. However, in certain situations, the OCT is safe and even beneficial. For instance, in cases of suspected fetal growth restriction or placental insufficiency, the OCT can help assess fetal reserve and adaptability to stress. This is because a normal fetal heart rate response to oxytocin infusion indicates a healthy fetus that can tolerate the stress of uterine contractions.

**Why Each Wrong Option is Incorrect**
* **Option A:** In cases of preterm labor, oxytocin challenge test is contraindicated as it may induce preterm labor.
* **Option B:** In cases of multiple gestations, oxytocin challenge test is contraindicated due to the increased risk of uterine hyperstimulation and fetal distress.
* **Option C:** In cases of previous uterine surgery or cesarean section, oxytocin challenge test is contraindicated due to the risk of uterine rupture.

**Clinical Pearl / High-Yield Fact**
Oxytocin challenge test is contraindicated in any situation where the fetus or mother is at risk of significant stress or harm, such as multiple gestations, preterm labor, or previous uterine surgery.

**Correct Answer: C. In cases of suspected fetal growth restriction or placental insufficiency.**