Which type of microorganism is responsible for causing actinomycosis?

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A fungal organismAn acid-fast, immobile rod-shaped bacteriumAnaerobic, gram-positive bacteria that are not acid-fastA type of retrovirusNone of the above

Explanation

Actinomycosis is caused by anaerobic, gram-positive bacteria that do not stain acid-fast. It is not caused by fungi, acid-fast bacilli, or retroviruses.