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: Unknown
[{'content': 'The below rash was seen in a person. He has a family history of asthma. What could be the most probable diagnosis? \nSelect and explain. \nA. Seborrheic dermatitis, B. Atopic dermatitis, C. Allergic contact dermatitis, D. Erysipelas', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ref. Rook's Textbook of Dermatology, Pg 99\n\xa0\nAllergic contact\xa0dermatitis\xa0is a form of\xa0dermatitis/eczema\xa0caused by an allergic reaction to a material, called an\xa0allergen, in contact with the skin.\nPathogenesis\n\nAllergic contact\xa0dermatitis\xa0is a type 4 or delayed hypersensitivity reaction and occurs 48–72 hours after exposure to the\xa0allergen. \xa0\nThe mechanism involves CD4+ T-lymphocytes, which recognise an\xa0antigen\xa0on the skin surface, releasing\xa0cytokines\xa0that activate the immune system and cause the\xa0dermatitis.", 'role': 'assistant'}]