Answer:
The correct option is : c. herpes simplex viruses
Explanation:
Herpes simplex is the most common sexually transmitted infection which is caused by the herpes simplex viruses. The two types of herpes simplex virus are : 1 and 2.
The herpes simplex virus 1 causes oral herpes and is also responsible for the formation of the fever blisters and cold sores around the mouth and on the face of the infected person.
Therefore, cold sores are associated with the herpes simplex virus.
