This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Most common form of actinomycosis \nSelect and explain. \nA. Facio cervical, B. Thorasic, C. Right illiac fossa, D. Liver', 'role': 'user'}, {'content': "Answer: A \nExplanation: Actinomycosis is caused by Actinomyces israelii. Facio-cervical is the most common type. Infection spreads either from tonsil or from adjacent tooth. Actinomyces israelii is an anaerobic gram - positive fungal like bacterium. It is called as Ray fungus. Reference : SRB's Manual of Surgery, 6th Edition, page no = 54.", 'role': 'assistant'}]