**Core Concept**
Right axis deviation (RAD) in ECG is characterized by an abnormal electrical axis that shifts to the right, typically beyond +100°. This occurs due to alterations in the electrical conduction system of the heart, often resulting from various cardiac or systemic conditions.

**Why the Correct Answer is Right**
To determine the condition that does not cause right axis deviation, let's review the typical causes of RAD. Conditions such as right ventricular hypertrophy, pulmonary embolism, and cor pulmonale often result in RAD due to the increased workload on the right ventricle or altered hemodynamics. **Option B**, Left Bundle Branch Block (LBBB), typically causes a left axis deviation due to the delayed activation of the left ventricle, not right axis deviation.

**Why Each Wrong Option is Incorrect**
* **Option A:** Right ventricular hypertrophy is a classic cause of right axis deviation, so this option is incorrect.
* **Option C:** Cor pulmonale, a condition of right ventricular failure, often results in right axis deviation, making this option incorrect.
* **Option D:** Pulmonary embolism can cause right axis deviation by increasing the resistance to blood flow through the pulmonary arteries, leading to right ventricular strain.

**Clinical Pearl / High-Yield Fact**
It's essential to note that right axis deviation can be a sign of underlying cardiac or systemic disease, and a thorough clinical evaluation is necessary to identify the underlying cause.

**Correct Answer:** B. Left Bundle Branch Block (LBBB)