## **Core Concept**
The order in which cardiac chambers are opened during an autopsy is crucial for preventing artefactual damage and ensuring accurate examination. This sequence helps in preserving the natural state of the chambers and their contents for pathological assessment.

## **Why the Correct Answer is Right**
The correct sequence for opening cardiac chambers during an autopsy is typically: **Right atrium**, **Right ventricle**, **Left atrium**, and **Left ventricle**. This order is chosen to prevent blood from one chamber contaminating others and to minimize damage to the heart. Starting with the **Right atrium** and then moving to the **Right ventricle** allows for examination of the right heart without causing unnecessary disruption. Subsequently, opening the **Left atrium** and then the **Left ventricle** enables thorough inspection of the left heart. Therefore, the sequence that matches this order is: **iii) Right atrium**, **iv) Right ventricle**, **i) Left atrium**, **ii) Left ventricle**.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This sequence starts with the left side, which could potentially cause blood to flow from the left chambers into the right chambers, contaminating them.
- **Option B:** This option also begins with the left atrium, which is not the standard approach for autopsy dissections.
- **Option D:** Starting with the left ventricle would likely cause significant disruption and is not a standard approach.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that during an autopsy, the order of opening the heart chambers is **Right atrium → Right ventricle → Left atrium → Left ventricle**. This helps in maintaining the integrity of the cardiac structure for accurate pathological analysis.

## **Correct Answer:** . C. iii, iv, i, ii.