**Core Concept**
The question is testing the ability to identify viruses that are shed in stool, highlighting the importance of understanding the replication and transmission dynamics of various viral pathogens. This requires knowledge of the viral life cycle, including replication, shedding, and transmission.

**Why the Correct Answer is Right**
The correct answer is a virus that replicates in the gastrointestinal tract and is shed in high quantities in the stool. This virus is a common cause of gastroenteritis and is highly contagious. The virus infects enterocytes and replicates within the intestinal epithelial cells, leading to inflammation and damage to the intestinal lining. As a result, the virus is shed in large quantities in the stool, making it a primary mode of transmission.

**Why Each Wrong Option is Incorrect**
* **Option A:** This virus is primarily shed in respiratory secretions and is not typically associated with gastrointestinal shedding.
* **Option B:** This virus is primarily shed in saliva and is not typically associated with gastrointestinal shedding.
* **Option C:** Although this virus can cause gastrointestinal symptoms, it is not typically shed in stool and is more commonly associated with respiratory shedding.

**Clinical Pearl / High-Yield Fact**
The viruses that are shed in stool are often highly contagious and can cause significant outbreaks of gastroenteritis. It is essential to practice good hygiene, including frequent handwashing and proper disposal of human waste, to prevent the spread of these viruses.

**Correct Answer:** C. Rotavirus is shed in stool.