**Core Concept**
The detection of fetal hypoxia through cardiotocography (CTG) involves analyzing the fetal heart rate patterns in response to uterine contractions. Fetal hypoxia can lead to changes in the fetal heart rate, which can be identified on a CTG.

**Why the Correct Answer is Right**
Fetal hypoxia can cause a decrease in the baseline fetal heart rate, also known as a non-reassuring fetal heart rate pattern. The most significant finding in CTG for detection of fetal hypoxia is **late decelerations**. Late decelerations are a type of abnormal heart rate pattern that occurs in the second half of the uterine contraction cycle. They are associated with fetal hypoxia due to placental insufficiency or cord compression. Late decelerations are thought to be caused by the fetus's attempt to compensate for the decreased oxygen supply by increasing the heart rate, but ultimately leading to a decrease in the baseline heart rate.

**Why Each Wrong Option is Incorrect**
**Option A:** Early decelerations are a normal response to fetal head compression and are not associated with fetal hypoxia. They are characterized by a slow decrease in the fetal heart rate that occurs at the beginning of the uterine contraction.
**Option B:** Variable decelerations are associated with umbilical cord compression and are not a specific indicator of fetal hypoxia. They are characterized by a sudden decrease in the fetal heart rate that occurs at any time during the uterine contraction.
**Option C:** Accelerations are a normal response to fetal movement and are associated with a healthy fetus. They are characterized by an increase in the fetal heart rate that occurs after the uterine contraction.

**Clinical Pearl / High-Yield Fact**
When interpreting a CTG, it's essential to remember that late decelerations are a specific indicator of fetal hypoxia, while early decelerations and accelerations are normal responses to uterine contractions.

**Correct Answer:** C.