## **Core Concept**
The core concept being tested here is the effectiveness or failure rate of condoms as a contraceptive method. The failure rate of a contraceptive method is a measure of how often it fails to prevent pregnancy during a specific period, usually expressed as the number of failures per 100 users over a year.

## **Why the Correct Answer is Right**
The correct answer, **2-3%**, reflects the typical failure rate associated with the use of condoms. This rate means that out of 100 couples using condoms as their method of contraception over a one-year period, 2 to 3 pregnancies can be expected. This failure rate is influenced by various factors including correct and consistent use, the quality of the condoms, and the population's characteristics. When used perfectly, condoms have a much lower failure rate, but typical use sees a slightly higher rate due to human error.

## **Why Each Wrong Option is Incorrect**
- **Option A:** *Less than 1%* - This option underestimates the typical failure rate of condoms. While perfect use can achieve very low failure rates, typical use, which accounts for most real-world scenarios, results in a higher failure rate.
- **Option B:** *10-15%* - This option overestimates the typical failure rate. Although not negligible, the failure rate of condoms is generally reported to be lower than this range.
- **Option D:** *20-25%* - This option significantly overestimates the failure rate of condoms. Such high failure rates are more commonly associated with less effective contraceptive methods.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the effectiveness of condoms not only depends on their proper use but also on their consistent use. Education on correct usage and handling can significantly reduce the failure rate. Additionally, condoms are the only contraceptive method that also provides protection against sexually transmitted infections (STIs), making them a crucial tool in both contraception and STI prevention.

## **Correct Answer:** B. 2-3%