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
Mahesh a 7-year old boy had itchy, excoriated papules on the forehead and the exposed pas of the arms and legs for 3 years. The disease was most severe in the rainy season and improved completely in winter. Most likely diagnosis is ? 
Select and explain. 
A. Insect bite hypersensitivity, B. Contact dermatitis, C. Varicella zoster, D. Dermatitis herpetiformis
A: Insect bite hypersensitivity
Answer: A: Insect bite hypersensitivity 
Explanation: Ans. is 'a' i.e., Insect bite hypersensitivity