**Core Concept**
Afrezza is an **insulin inhalation powder** used for the control of **hyperglycemia** in adult patients with **diabetes mellitus**. It is a **rapid-acting insulin** analog. The color-coded formulations help in distinguishing between different doses.

**Why the Correct Answer is Right**
The yellow color in Afrezza's color-coded formulations indicates a **12-unit dose**. This is part of the drug's design to help patients and healthcare providers quickly identify the correct dose, reducing errors. Afrezza's unique formulation allows for **rapid absorption** of insulin through the lungs, making it suitable for controlling **postprandial glucose spikes**.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not correspond to the yellow color code.
**Option B:** Incorrect as it is not associated with the yellow color.
**Option C:** Incorrect because the yellow color specifically indicates a different dose.

**Clinical Pearl / High-Yield Fact**
Remember, Afrezza is a **rapid-acting insulin** and its effects can start within **15-30 minutes** of inhalation, peaking at about **1 hour**. This makes it particularly useful for managing **postprandial hyperglycemia**.

**Correct Answer:** D. 12 unit dose