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
[{'content': 'Which of the following is Gram positive: March 2005 \nSelect and explain. \nA. Veillonella, B. Bacteroides, C. Fusobacterium, D. Actinomyces', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]