**Core Concept**
Autopsy is a crucial diagnostic tool in forensic medicine and pathology. An inconclusive autopsy occurs when the examination of the body and its tissues does not provide a definitive cause of death or diagnosis, often due to putrefaction, decomposition, or other factors that hinder thorough examination.

**Why the Correct Answer is Right**
The term "inconclusive autopsy" is used when the autopsy findings are insufficient to determine the cause of death with certainty. This can be due to various reasons, such as advanced decomposition, lack of tissue samples, or insufficient histopathological examination. In such cases, additional investigations, including toxicology reports, radiological imaging, or further histopathological examination, may be required to establish a diagnosis.

**Why Each Wrong Option is Incorrect**
**Option A:** **Livor mortis** refers to the pooling of blood in the dependent parts of the body after death, which is a normal post-mortem change. It does not relate to the concept of an inconclusive autopsy.
**Option B:** **Mummification** is a process of natural preservation of the body, often seen in arid environments. While it may affect the autopsy findings, it does not directly relate to an inconclusive autopsy.
**Option C:** **Post-mortem changes** refer to the changes that occur in the body after death, including livor mortis, rigor mortis, and algor mortis. While these changes can affect the autopsy, they do not define an inconclusive autopsy.

**Clinical Pearl / High-Yield Fact**
It is essential to note that an inconclusive autopsy does not necessarily mean that the death is unnatural or suspicious. In many cases, it may be due to natural causes or an accidental death, and further investigations may be required to establish the cause of death.

**Correct Answer:** C.