This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Impetigo contagiosa is caused by - \nSelect and explain. \nA. Group A beta hemolytic streptococci, B. Staphylococcus, C. H.influenzae, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Group A beta hemolytic streptococci", 'role': 'assistant'}]