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: Dental
Infantile atopic dermatitis commonly involves 
Select and explain. 
A. Flexors, B. Extensors, C. Head & neck, D. Perianal area
B: Extensors
Answer: B: Extensors 
Explanation: Infantile atopic dermatitis (2 months - 2 years): More commonly involves extensors.
Childhood atopic dermatitis (2 - 10 years): Commonly involves flexors
Adolescent atopic dermatitis (> 10 years): Commonly involves flexors, hand & feet.