**Core Concept**
The ideal place to record body temperature in a dead body is crucial for forensic and clinical purposes. The rectal temperature is often used as a reliable indicator of the time of death, as it remains relatively stable even after death.

**Why the Correct Answer is Right**
The rectum is an ideal location for temperature recording in a dead body because it is relatively isolated from the environment, and the temperature is less likely to be affected by external factors. The rectal temperature is also a good indicator of the body's core temperature, which remains stable for a longer period after death. This is because the rectum is a part of the large intestine, which is richly supplied with blood and has a relatively constant temperature.

**Why Each Wrong Option is Incorrect**
**Option A:** The axilla is not an ideal location for recording body temperature in a dead body because it is more susceptible to environmental temperature changes. The axillary temperature can fluctuate significantly due to the proximity of the armpit to the surface of the body.
**Option B:** Oral temperature is not reliable in a dead body because the mouth and throat are not isolated from the environment, and the temperature can be affected by external factors such as the surrounding air temperature.
**Option C:** The tympanic membrane temperature is not a reliable indicator of the body's core temperature in a dead body because it can be affected by the ambient temperature and other environmental factors.

**Clinical Pearl / High-Yield Fact**
When recording body temperature in a dead body, it is essential to use a thermometer that is specifically designed for this purpose, and to follow standard protocols to minimize the risk of error.

**Correct Answer: C. Rectum.