This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
A nursing mother presented with fever and breast tenderness after two weeks postpaum. Which oral antibiotic is ideal for her condition 
Select and explain. 
A. Ceftazidime, B. Dicloxacillin, C. Ciprofloxacin, D. Ampicillin
B: Dicloxacillin
Answer: B: Dicloxacillin 
Explanation: * Peurperal Mastitis is a skin & soft tissue infection caused by Staphylococcus aureus that occurs in 1-3% of nursing mothers after 2-3 weeks postpaum. * It presents with features ranging from signs of local breast inflammation (cellulitis to abscess) associated with systemic signs of fever, chills, malaise, anorexia, lethargy, etc. in severe cases. * Dicloxacillin is an acid stable beta-lactamase resistant anti-Staphylococcal Penicillin - the preferred treatment choice for penicillinase-producing Staphylococcus aureus and Staphylococcus epidermidis that are not methicillin resistant. Ref:- Harrisons Principles of Internal Medicine 20th Ed; Pg Num:-1079