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: Dental
"Sycosis barbae" is caused by 
Select and explain. 
A. Streptococcus aureus, B. Pseudomonas, C. Trichophyton rubrum, D. Staphylococcus aureus
D: Staphylococcus aureus
Answer: D: Staphylococcus aureus 
Explanation: It is the repeated infection of bearded region by Staphylococcus.aureus.