This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Which of the following is Gram positive: March 2005 
Select and explain. 
A. Veillonella, B. Bacteroides, C. Fusobacterium, D. Actinomyces
D: Actinomyces
Answer: D: Actinomyces 
Explanation: Ans. D: Actinomyces Anaerobic bacteria Rods? - Gram positive - Clostridia Gram negative - Bacteroides, Fusobacterium Cocci ? - Gram positive - Streptococci, Peptococci, Peptpstreptococci --Gram negative Veillonella Filamentous ? - Gram positive - Actinomyces -Gram negative - Various gut organisms