This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Scabies and other infestations, Subject name: Dental
A child has multiple itchy papular lesions on genitalia and fingers. Similar lesions are also noted in his younger brother. What is the diagnosis? 
Select and explain. 
A. Papular uicaria, B. Scabies, C. Atopic dermatitis, D. Allergic contact dermatitis
B: Scabies
Answer: B: Scabies 
Explanation: The four cardinal features suggestive of scabies 1 Presence of burrow in S. Corneum especially on the hand or penis 2 Characteristic distribution of lesions: Face, palm, soles involved in infants but spared in adults. Circle of Hebra: Web spaces, groins, periumblical area and flexors of wrist, elbow & axilla. 3 History of similar illness in other family members 4 Intense pruritus (nocturnal)