Rectal temperature in hypothermia should be < than_______degree Celsius?

**Core Concept**
Hypothermia is a medical condition characterized by a lower than normal body temperature, which can cause various physiological and metabolic changes. Rectal temperature is often used as a reliable indicator of body temperature in hypothermia.

**Why the Correct Answer is Right**
The correct answer is 35 degrees Celsius. This is because hypothermia is typically defined as a body temperature below 35°C (95°F). Rectal temperature is a reliable indicator of core body temperature, and a value below 35°C indicates severe hypothermia, which can lead to life-threatening complications. The hypothalamus, the body's temperature regulation center, responds to a decrease in core temperature by activating various physiological mechanisms to conserve heat and maintain normal body temperature.

**Why Each Wrong Option is Incorrect**
* **Option A:** 37°C is the normal human body temperature, not a threshold for hypothermia.
* **Option B:** 32°C is a temperature at which hypothermia can occur, but the correct answer is the specific threshold for severe hypothermia.
* **Option C:** 38°C is an elevated body temperature, indicating fever or hyperthermia, not hypothermia.

**Clinical Pearl / High-Yield Fact**
Remember that hypothermia can occur in various settings, including exposure to cold environments, medical conditions such as thyroid disorders, and certain medications that affect the body's temperature regulation.

**Correct Answer: B. 35 degrees Celsius.**