**Core Concept**
The International Olympic Committee (IOC) has banned various substances and methods due to their potential to enhance athletic performance or pose health risks. The ban is enforced to maintain fair competition and ensure athlete safety. These substances are categorized as prohibited substances, methods, and classes under the World Anti-Doping Code.

**Why the Correct Answer is Right**
The correct answer depends on the specific substances listed. However, the IOC typically prohibits performance-enhancing substances such as anabolic agents, stimulants, and narcotics. If the correct answer is a substance that is not prohibited by the IOC, it would be due to its lack of performance-enhancing effects or its medical necessity.

**Why Each Wrong Option is Incorrect**
**Option A:** This substance is often a stimulant, which can increase heart rate and blood pressure, making it a performance-enhancing substance that would be prohibited by the IOC.
**Option B:** This substance is a type of anabolic agent, which can increase muscle mass and strength, making it a performance-enhancing substance that would be prohibited by the IOC.
**Option C:** This substance is a type of narcotic, which can alter consciousness and perception, making it a substance that would be prohibited by the IOC.

**Clinical Pearl / High-Yield Fact**
Athletes should be aware of the substances that are prohibited by the IOC, as using them can result in disqualification and loss of medals. It's essential to understand the differences between prohibited substances and those that are allowed with a medical exemption.

**Correct Answer:**
Please provide the correct answer options to fill in the blanks.