This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Skin
In Acne rosacea, the main pathogenesis is: 
Select and explain. 
A. Unknown, B. Increased sebum production, C. Increased reactivity of cutaneous blood vessels to vasodilators, D. Telangiectasia is present over whole face along with the exposed part of back where papules & pustules are also present
A: Unknown
Answer: A: Unknown 
Explanation: Ans. A. UnknownAcne rosacea - Disease of unknown etiology, Papules & pustules over central face (but never over any other part of body); Telangiectasia of nose & cheeks; Facial erythema.a. Flushing reaction to hot, spicy foods & alcohol but no increased reactivity of cutaneous blood vessels to vasodilators.b. Sebum production is normal.Tit-Topical & oral antibiotics; topical metronidazole; avoidance of hot, spicy foods & alcohol.