Final answer:
Gonorrhea is the STI referred to as the 'great imitator' because it can mimic the symptoms of other STIs. It is caused by the bacteria Neisseria gonorrhoeae and can infect various body tissues.
Step-by-step explanation:
Gonorrhea is the STI referred to as the 'great imitator.' It is caused by the bacteria Neisseria gonorrhoeae, which can infect various body tissues and cause symptoms such as urethritis.
The name 'great imitator' comes from the fact that gonorrhea can mimic the symptoms of other STIs, making it difficult to diagnose based on symptoms alone.