Which of the following statements about metronidazole is true?

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It does not cause any adverse effectsIt is utilized in the treatment of acute necrotizing ulcerative gingivitis (ANUG)It primarily accumulates in salivaIt is effective against aerobic gram-positive bacteria

Explanation

Metronidazole is commonly employed in the treatment of acute necrotizing ulcerative gingivitis (ANUG) due to its activity against anaerobic bacteria. Contrary to option A, it can cause side effects. It does not mainly concentrate in saliva (option C), and it is not effective against aerobic gram-positive organisms (option D).