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: Skin
Difference in acne rosacea & acne vulgaris- 
Select and explain. 
A. Pustule, B. Erythema, C. Papule, D. Absence of comedone
D: Absence of comedone
Answer: D: Absence of comedone 
Explanation: Ans. is 'd' i.e., Absence of comedone