## Core Concept
The Eutectic Mixture of Local Anesthetics (EMLA) is a topical anesthetic cream used to prevent pain on the skin. It combines two local anesthetics, lidocaine and prilocaine, in a specific ratio to produce a eutectic mixture that has a lower melting point than either substance alone, enhancing its absorption through the skin.

## Why the Correct Answer is Right
The EMLA cream contains 2.5% lidocaine and 2.5% prilocaine. This mixture leverages the eutectic effect, where the combination of lidocaine and prilocaine lowers the melting point of the mixture, allowing it to more easily penetrate the skin and provide effective local anesthesia. The specific percentage of lidocaine in EMLA is 2.5%, making option C the correct answer.

## Why Each Wrong Option is Incorrect
- **Option A:** 1% is too low compared to the actual concentration of lidocaine in EMLA.
- **Option B:** 5% is too high; it does not accurately reflect the concentration of lidocaine in EMLA.
- **Option D:** 10% is significantly higher than the actual concentration of lidocaine in EMLA.

## Clinical Pearl / High-Yield Fact
A key point to remember is that EMLA cream contains equal percentages of lidocaine and prilocaine (2.5% each), and it requires about 30-60 minutes to take full effect. It's commonly used for minor surgical procedures, especially in pediatric patients to alleviate pain from needle procedures.

## Correct Answer: C. 2.5%