Final answer:
The Influenza virus is not commonly associated with the common cold; it causes more severe illnesses such as pneumonia.
Step-by-step explanation:
The virus that is not commonly associated with the common cold is c) Influenza virus. The flu, caused by the influenza virus, leads to more severe symptoms as compared to those of the common cold and is associated with diseases like pneumonia. Other viruses such as rhinovirus, coronavirus, and respiratory syncytial virus are usually responsible for the milder symptoms associated with the common cold.