## Core Concept
Cardiopulmonary resuscitation (CPR) is an emergency procedure that combines chest compressions with rescue breaths to help maintain blood circulation and oxygenation of vital organs when a person's heart has stopped beating. The goal of CPR is to preserve brain function until further measures are taken to restore spontaneous blood circulation and breathing. CPR is a critical skill that is widely taught and is a key component of first aid and advanced cardiac life support.

## Why the Correct Answer is Right
The correct answer emphasizes the importance of early initiation of CPR, particularly in cases of cardiac arrest. When the heart stops beating, every minute counts, and the sooner CPR is started, the better the chances of successful resuscitation. CPR helps to manually maintain blood circulation and oxygenation, reducing the risk of brain damage and other complications.

## Why Each Wrong Option is Incorrect
**Option A:** This option is incorrect because it does not accurately reflect a true statement regarding CPR. Without the specific text of option A, we cannot provide a detailed explanation, but we can infer that it does not align with established CPR guidelines.

**Option B:** Similarly, this option is incorrect as it does not represent a true statement about CPR. The specifics of option B are not provided, but it is clear that it does not accurately describe a principle or practice of CPR.

**Option C:** This option is also incorrect for the same reasons as options A and B; it does not accurately reflect a true statement about CPR.

## Clinical Pearl / High-Yield Fact
A crucial aspect of CPR is the "chain of survival," which includes early recognition of cardiac arrest, early CPR, early defibrillation (if applicable), and early advanced cardiac life support. Remembering the phrase "Call, Compress, Clear, and Care" or similar mnemonics can help recall the steps and importance of CPR.

## Correct Answer Line
**Correct Answer: D.**