This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Drug of choice for actinomycosis: 
Select and explain. 
A. Penicillin, B. Sulfonamides, C. Tetracycline, D. Azithromycin
A: Penicillin
Answer: A: Penicillin 
Explanation: 78. Ans: a (Penicillin) Ref: Harrison's, 16th ed, p. 939; 17th ed, p. 998Treatment of actinomycosis is intravenous administration of of penicillin 18-24 million units daily for 2- 6 weeks, followed by oral therapy with penicillin or amoxicillin (total duration. 6-12 months). This is a reasonable guideline for serious infections and bulky disease. Less extensive disease, particularly that involving the oral-cervicofacial region, may be cured with a shorter course.