This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Blepharitis acarica is caused by - \nSelect and explain. \nA. Streptococcus, B. Ascaricus, C. Propionibacterium, D. Demodex folliculorum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: REF IMG', 'role': 'assistant'}]