Rubbing alcohol, used rubdowns, on its evaporation reduces fever. It is cheaper and has replaced ethanol for this purpose. Its name is:

Options

A. Methanol
B. Ethanol
C. Amyl alcohol
D. Isopropyl alcohol

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question is asking for the name of the alcohol that is commonly used for rubdowns to reduce fever, which is cheaper and has replaced ethanol for this purpose.

2. **Identifying Key Characteristics**:
- The alcohol should be effective in reducing fever through evaporation.
- It should be cheaper than ethanol.
- It is referred to as "rubbing alcohol".

3. **Eliminating Options**:
- Ethanol is mentioned in the question as having been replaced, so it cannot be the answer.
- Amyl alcohol and methanol are also not suitable for this purpose due to their toxicity and other properties.

4. **Identifying the Correct Alcohol**:
- The most common type of rubbing alcohol is isopropyl alcohol (also known as isopropanol).
- Isopropyl alcohol is widely used for its antiseptic properties and effectiveness in reducing fever through evaporation.

5. **Conclusion**: Based on the characteristics and elimination of other options, the answer is isopropyl alcohol.

**Final Answer**: Isopropyl alcohol.

---