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: Medicine
[{'content': "In Still's disease the transient cutaneous rash coinside with the fever spike. The rash is due to: \nSelect and explain. \nA. Neutrophil infiltration in the dermis, B. Lymphocyte infiltration in the dermis, C. Eosinophil infiltration in the dermis, D. None of the above", 'role': 'user'}, {'content': "Answer: A \nExplanation: The rash in still's disease is due to neutrophil infiltration in the dermis. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 416", 'role': 'assistant'}]