This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dermatitis, Subject name: Dental
A 3 year old child has eczematous dermatitis on extensor surfaces. His mother has a history of Bronchial asthma. Diagnosis should be- 
Select and explain. 
A. Atopic dermatitis, B. Contact dermatitis, C. Seborrhic dermatitis, D. Infantile eczematous dermatitis
A: Atopic dermatitis
Answer: A: Atopic dermatitis 
Explanation: Atopic dermatitis is a chronic inflammatory skin disease primarily beginning in childhood with a variable natural course with variable rates of remission.symptoms recur or continue till adulthood. Itch is the typical symptom often leads to sleep disturbance and secondary infections. Often associated with asthma and allergic rhinitis. Pathogenesis : defect in skin barrier function, fillagrin defect, altered immunological response. fitzpatrick textbook of dermatology , page 363,9thedition