**Core Concept:** Inverted T waves are a characteristic ECG finding that may indicate ischemia, infarction, or injury to the heart due to various causes. T waves are typically negative in leads that are positioned over the inferior and anterior walls of the heart, reflecting the depolarization of the ventricles.

**Why the Correct Answer is Right:** Inverted T waves are observed in lead II, III, and aVF, which are placed over the inferior wall of the heart. In these leads, the T wave is usually positive, indicating ventricular repolarization. However, when ischemic or infarction occurs, the normal repolarization process is disrupted, leading to inverted T waves. This is due to the loss of normal repolarization and the presence of abnormal repolarization, which is characterized by a negative T wave.

**Why Each Wrong Option is Incorrect:**

A. **Option A (ST elevation):** ST elevation is the increased voltage in the ST segment and is seen in acute myocardial infarction due to ischemia or occlusion of coronary arteries. Inverted T waves, however, reflect abnormal repolarization, not ischemia/infarction.

B. **Option B (ST depression):** ST depression represents reduced voltage in the ST segment and is seen in myocardial ischemia or infarction. Inverted T waves, on the other hand, indicate abnormal repolarization.

C. **Option C (Normal T waves):** Normal T waves, if in the expected leads, are not an issue. However, the focus here is on inverted T waves which indicate abnormal repolarization.

D. **Option D (ST segment elevation):** ST elevation, as explained above, is associated with ischemia or infarction, not inverted T waves which represent abnormal repolarization.

**Clinical Pearl:** Inverted T waves in the aforementioned leads should raise suspicion for myocardial ischemia or infarction and prompt further evaluation for potential cardiac events. Corresponding ECG changes are usually accompanied by clinical signs and symptoms of myocardial ischemia or infarction.