This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Dental
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: Erythema and papulo-pustule (papules and pustules) are seen both in Acne rosacea and Acne vulgaris Comedones are absent in Acne rosacea (a characteristic feature of Acne vulgaris) Ref Harrison 20th edtion pg 1213