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: Skin
[{'content': 'Impetigo contageosa most commonly due to : \nSelect and explain. \nA. Group B Streptococcous, B. Staphylococcus, C. Moniliasis, D. Streptococcus Viridans', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Staphylococcus', 'role': 'assistant'}]