**Core Concept**
Left axis deviation (LAD) on an electrocardiogram (ECG) indicates that the electrical impulse is delayed in its path through the left ventricle, resulting in a shift of the electrical axis to the left. This can be due to various factors affecting the conduction system of the heart.

**Why the Correct Answer is Right**
Left axis deviation can be seen in conditions that affect the electrical conduction system of the heart, such as left ventricular hypertrophy (LVH), where the heart muscle thickens, altering the electrical axis. It can also be seen in conditions like Wolff-Parkinson-White (WPW) syndrome, where an accessory electrical pathway causes premature depolarization of the ventricles. Additionally, left axis deviation can be seen in conditions like left bundle branch block (LBBB), where the electrical impulse is delayed in its path through the left ventricle.

**Why Each Wrong Option is Incorrect**
**Option A:** This condition is actually associated with left axis deviation. Left ventricular hypertrophy (LVH) is a common cause of LAD due to the thickening of the heart muscle.
**Option B:** This condition is also associated with left axis deviation. Wolff-Parkinson-White (WPW) syndrome is a condition where an accessory electrical pathway causes premature depolarization of the ventricles, leading to LAD.
**Option C:** This is the correct answer. Right ventricular hypertrophy (RVH) is typically associated with right axis deviation (RAD), not left axis deviation. RVH occurs when the right ventricle thickens, altering the electrical axis to the right.

**Clinical Pearl / High-Yield Fact**
Mnemonic: "LEFT" stands for "LVH", "WPW", "LBBB", and "Tricuspid Atresia", all of which are conditions associated with left axis deviation.

**Correct Answer: C. Right ventricular hypertrophy.**