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
Most common form of actinomycosis 
Select and explain. 
A. Facio cervical, B. Thorasic, C. Right illiac fossa, D. Liver
A: Facio cervical
Answer: A: Facio cervical 
Explanation: 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.