11. Acne is caused by infection of the sebaceous glands by Propionibacterium acne, which is Gram-positive bacterium whose cell wall composed of which of the following? (A) thick lipopolysaccharide layer (B) thick peptidoglycan layer (C) thin lipopolysaccharide layer over a thick peptidoglycan layer (D) thick lipopolysaccharide layer over a thin peptidoglycan layer (E) thick lipopolysaccharide layer over a thick peptidoglycan layer