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
Blepharitis acarica is caused by - 
Select and explain. 
A. Streptococcus, B. Ascaricus, C. Propionibacterium, D. Demodex folliculorum
D: Demodex folliculorum
Answer: D: Demodex folliculorum 
Explanation: REF IMG