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: Microbiology
[{'content': 'Treatment for streptococcal necrotizing fasciitis is \nSelect and explain. \nA. Surgical debridement, B. Penicillin, C. Clindamycin, D. Metronidazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Streptococcal subcutaneous infections range from cellulitis to necrotizing fasciitis. Necrotizing fasciitis is more commonly caused by mixed aerobic and anaerobic bacterial infections, but some strains(M types 1 and 3 forming pyrogenic exotoxin A) may alone be responsible. These strains have earned the name "flesh-eating bacteria". Though the isolates are penicillin sensitive in vitro, treatment with penicillin may not be effective. Vancomycin is the drug of choice in life-threatening infections. Reference: Textbook of Microbiology; Anathanarayan and paniker\'s; 10th edition; Page no: 214', 'role': 'assistant'}]