**Core Concept**
Suxamethonium is a non-depolarizing muscle relaxant that is commonly used in anesthesia to facilitate endotracheal intubation. Its shelf-life is an important consideration for healthcare providers to ensure its efficacy and safety.

**Why the Correct Answer is Right**
Suxamethonium is a hydrolyzed compound that degrades over time, particularly in the presence of water and light. The degradation process involves the hydrolysis of the ester bond, resulting in the formation of succinylmonocholine and choline. This degradation affects the potency and efficacy of suxamethonium, making it essential to monitor its shelf-life. The correct shelf-life of suxamethonium is 24 months when stored in a clear, colorless aqueous solution at 2-8°C.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the storage conditions, which are crucial for determining the shelf-life of suxamethonium.
**Option B:** This option is incorrect because it does not accurately reflect the shelf-life of suxamethonium when stored under the specified conditions.
**Option C:** This option is incorrect because it is too short for the shelf-life of suxamethonium, which can be safely stored for up to 24 months.

**Clinical Pearl / High-Yield Fact**
When handling suxamethonium, it is essential to store it in a clear, colorless aqueous solution at 2-8°C to maintain its potency and efficacy. This is crucial for ensuring the safe and effective use of this medication in clinical practice.

**Correct Answer:** C.