## **Core Concept**
Marc Koska is associated with a significant medical invention. The question pertains to his contribution to medical science, specifically in the context of devices or techniques used in medical practice.

## **Why the Correct Answer is Right**
Marc Koska is best known for inventing the **GlideScope**, a type of **video laryngoscope**. The GlideScope is a medical device used for tracheal intubation, which is a critical procedure in anesthesiology and critical care medicine. It utilizes a high-resolution video camera to facilitate the visualization of the airway, making the intubation process easier and safer, especially in patients with difficult airways.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because, without specifying what A refers to, it's impossible to directly address its accuracy. However, given that Marc Koska is known for the GlideScope, if A does not relate to the GlideScope or a similar significant medical device invention, it would be incorrect.
- **Option B:** Similarly, without details on what B entails, we can't directly refute it. If B does not pertain to the invention of the GlideScope or another notable device by Marc Koska, it would be incorrect.
- **Option C:** This option is incorrect because, assuming C does not refer to the GlideScope, Marc Koska's notable invention.

## **Clinical Pearl / High-Yield Fact**
The GlideScope has revolutionized airway management by providing a clear view of the vocal cords and glottis, significantly reducing the difficulty of intubation. This device is particularly useful in emergency medicine and anesthesiology for patients with predicted or unexpected difficult airways.

## **Correct Answer:** D. GlideScope.