## Core Concept
The question tests knowledge of virology, specifically the morphology of viruses. Certain viruses have distinct shapes, such as helical, icosahedral, or complex structures. The wheel-shaped description hints at a virus with a characteristic appearance under electron microscopy.

## Why the Correct Answer is Right
The correct answer, Rotavirus, is known for its wheel-like appearance under an electron microscope, which is how it's often described. This morphology is due to its **icosahedral capsid** structure, which provides the virus with its characteristic look. Rotaviruses are a common cause of severe diarrhea in infants and young children worldwide.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because, without specifying, it's hard to directly refute, but given the context, it's not recognized for a wheel-shaped morphology.
* **Option B:** This option is incorrect as it does not correspond with the known morphology of major viruses; the description does not fit.
* **Option D:** This option is incorrect because, similar to option A, without specifics, it's hard to refute directly, but it's not known for the wheel-shaped appearance.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **Rotavirus** infections are a leading cause of severe diarrhea in children under 5 years old globally. The introduction of the rotavirus vaccine has significantly reduced the incidence of severe rotavirus gastroenteritis.

## Correct Answer: C. Rotavirus