**Core Concept**
The diagnosis of death by drowning involves the identification of characteristic post-mortem findings, including the presence of water in the lungs and airways, and the absence of other causes of death. The lungs are typically heavy, congested, and show signs of edema, with froth or foam present in the airways.

**Why the Correct Answer is Right**
In cases of drowning, the inhaled water enters the lungs and causes pulmonary edema, leading to congestion and frothing of the airways. The presence of water in the lungs is a key finding, as it distinguishes drowning from other causes of death such as aspiration or cardiac arrest. The lungs may also show signs of hemorrhage and congestion, and the airways may be filled with froth or foam.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a recognized post-mortem finding associated with drowning. While the lungs may be heavy and congested, this is not a specific or unique finding for drowning.
* **Option B:** This option is incorrect because it does not accurately describe the post-mortem findings associated with drowning. While water may enter the stomach, this is not a characteristic finding of drowning.
* **Option C:** This option is not a recognized post-mortem finding associated with drowning. While the heart may show signs of congestion or edema, this is not a specific or unique finding for drowning.

**Clinical Pearl / High-Yield Fact**
In cases of suspected drowning, it is essential to carefully examine the lungs and airways for signs of water entry, including the presence of froth or foam. This can help distinguish drowning from other causes of death, such as aspiration or cardiac arrest.

**Correct Answer: D. Water entry into the lungs and airways, with signs of congestion, edema, and frothing.**