**Core Concept**
Angina pectoris is a clinical manifestation of myocardial ischemia, typically resulting from transient imbalance between myocardial oxygen supply and demand. This imbalance can be caused by various factors, including atherosclerotic coronary artery disease, increased myocardial oxygen demand, or decreased oxygen supply.

**Why the Correct Answer is Right**
The patient's presentation of central, crushing chest pain that radiates to the jaw and is alleviated with rest is classic for angina pectoris. This type of pain is typically exertional, meaning it occurs with physical activity, and is relieved by rest or nitroglycerin. In this case, the ECG is normal, but the clinical presentation is indicative of myocardial ischemia. The pathophysiology involves transient narrowing of the coronary arteries due to atherosclerosis, resulting in reduced blood flow to the myocardium.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect because it does not match the clinical presentation of angina pectoris. A normal ECG does not rule out coronary artery disease or myocardial ischemia.
* **Option B:** This option may be tempting, but it is incorrect because the ECG is normal, which makes acute myocardial infarction less likely. However, it is essential to note that a normal ECG does not rule out myocardial infarction, especially in the early stages.
* **Option C:** This option is incorrect because the patient's symptoms are not consistent with a pulmonary embolism. Pulmonary embolism typically presents with sudden onset of dyspnea, pleuritic chest pain, and tachycardia, which are not described in this scenario.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that a normal ECG does not rule out coronary artery disease or myocardial ischemia. Many patients with angina pectoris or acute myocardial infarction may have a normal ECG, especially in the early stages. A high index of suspicion and a thorough clinical evaluation are necessary to make an accurate diagnosis.

**Correct Answer: D. Angina Pectoris**