This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
Which of the following organisms is most commonly associated with breast abscess? 
Select and explain. 
A. Staphylococcus Aureus, B. Pseudomonas, C. Propionobacterium Acnes, D. Staphylococcus Epidermidis
A: Staphylococcus Aureus
Answer: A: Staphylococcus Aureus 
Explanation: Ans. is 'a' i.e., Staphylococcus Aureus o Staphylocccus Aureus is the most common organism associated with Mastitis and Breast Abscess.o Staphylococcus epidermidis is part of normal skin flora, but is not a common cause of mastitis. Pseudomonas is a more common pathogen of the respiratory or urinary tract. Propionobacterium acnes is the bacteria most commonly associated with acne.