Color of oxygen cylinder is:
**Core Concept**
The color of oxygen cylinders is a critical safety feature, indicating the type of gas stored within. The coloration is standardized to prevent confusion and ensure proper handling of medical gases.
**Why the Correct Answer is Right**
The correct answer is based on the international standard for oxygen cylinders, which are typically painted a blue color to distinguish them from other medical gases. This coloration helps medical professionals quickly identify the contents of a cylinder, reducing the risk of accidental exposure to the wrong gas. The blue coloration is a result of the standardized guidelines set by organizations such as the International Organization for Standardization (ISO) and the Compressed Gas Association (CGA).
**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect, as the color of oxygen cylinders is not typically green. Green is often associated with other medical gases, such as nitrous oxide or carbon dioxide.
* **Option B:** This is incorrect, as the color of oxygen cylinders is not typically red. Red is often associated with other medical gases, such as oxygen under pressure or helium.
* **Option C:** This is incorrect, as the color of oxygen cylinders is not typically yellow. Yellow is often associated with other medical gases, such as nitrous oxide or carbon dioxide.
**Clinical Pearl / High-Yield Fact**
Remember that the color of oxygen cylinders is a critical safety feature, and it's essential to be familiar with the standardized coloration of medical gases to prevent accidents. Always verify the contents of a cylinder before use, and never rely solely on the color to determine the gas type.
**Correct Answer:** D. Blue