_ infection is caused by a viroid:
Correct answer: B. Hepatitis D
- A. Hepatitis A
- B. Hepatitis D
- C. Mad Cow disease
- D. Mysterious brain infection
Explanation
Hepatitis D (delta hepatitis) is caused by the hepatitis D virus (HDV), which is a unique RNA pathogen often classified with viroids because it is a small, circular RNA agent that requites hepatitis B virus for its replication and expression.
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