This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
Retromammary abscess arises from: 
Select and explain. 
A. Tuberculous rib, B. Infected hematoma, C. Chronic empyema, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. (d) All of the above(Ref. Internet Source)* Retromammary abscess is an extension from Breast abscess, Empyema Thoracis, Osteomyelitis of Ribs etc.* No need to drain the Retromammary abscess. Conservative treatment is enough.