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: Microbiology
Which of the following is the main colonizer of sebaceous gland - 
Select and explain. 
A. Propionic bacterium acnes, B. Diptheria, C. Strep.pyogens, D. Staph. aureus
A: Propionic bacterium acnes
Answer: A: Propionic bacterium acnes 
Explanation: Propionibacterium acnes are the commonest agent causing acne in teenagers as it has affinity for sebaceous glands.
Lesions in acne develop with in the sebaceous follicle.