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': 'Bullous impetigo is caused by: March 2013 \nSelect and explain. \nA. Staphylococcus aureus, B. Pseudomonas, C. Haemophilus influenzae, D. Clostridium perfringenes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Staphylococcus aureus Conditions caused by Staphylococcal aureus SSSS (Staphylococcal scalded skin syndrome), Bullous impetigo/Impetigo contagiosa, Furuncles/ Boils, Sycosis barbae and Sycosis nuchae', 'role': 'assistant'}]