**Core Concept**
The study of postmortem processes and their interpretation is a crucial aspect of forensic pathology, which involves analyzing the changes that occur in a deceased body after death to determine the cause and manner of death. This field relies heavily on the principles of postmortem changes, decomposition, and the interpretation of autopsy findings.

**Why the Correct Answer is Right**
The correct answer is **Medico-legal Autopsy**. A medico-legal autopsy is a detailed examination of a deceased body to determine the cause and manner of death, usually performed at the request of the authorities or the family of the deceased. The pathologist conducting the autopsy must analyze the postmortem changes, including rigor mortis, livor mortis, and algor mortis, as well as any injuries or diseases present.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a recognized term in forensic pathology.
* **Option B:** A postmortem examination is a general term that refers to any examination of a deceased body, but it does not specifically imply a medico-legal investigation.
* **Option C:** A histopathological examination is a microscopic examination of tissue samples to diagnose diseases, but it does not involve the study of postmortem processes or their interpretation.

**Clinical Pearl / High-Yield Fact**
A medico-legal autopsy must be performed by a qualified pathologist who is trained in forensic pathology, and the findings must be documented in a comprehensive report that can be used as evidence in court.

**Correct Answer:** D.