**Core Concept**
A CTG graph, also known as a cardiotocogram, is a graphical representation of fetal heart rate and uterine contractions during pregnancy, particularly in the third trimester. It is used to assess fetal well-being and monitor the progression of labor.

**Why the Correct Answer is Right**
The CTG graph displays two main components:
* The fetal heart rate (FHR) waveform, which shows the rate and variability of fetal heartbeats.
* The uterine contraction (UC) waveform, which represents the intensity and duration of uterine contractions.
Together, these waveforms provide valuable information about fetal health and the progression of labor. The correct answer is a graphical representation of both FHR and UC waveforms.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it only shows the fetal heart rate waveform without any uterine contractions, making it an incomplete CTG graph.
**Option B:** This option is incorrect because it shows a completely different type of graph, possibly a blood pressure tracing, which is not related to fetal monitoring.
**Option C:** This option is incorrect because it shows a waveform that is not relevant to fetal monitoring or uterine contractions.

**Clinical Pearl / High-Yield Fact**
A normal CTG graph typically shows a baseline fetal heart rate between 110-160 beats per minute, with moderate variability (5-25 beats per minute) and no late decelerations.

**Correct Answer:** D. A graphical representation of both fetal heart rate and uterine contractions waveforms.