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: Gynaecology & Obstetrics
[{'content': 'Herpes gestatioinalis is \nSelect and explain. \nA. Caused by Herpes virus, B. Autoimmune reaction to collagen XVII in  basement membrane of skin, C. Neutrophilic degranulation at dermal - epidermal junction, D. Less severe in subsequent pregnancies.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Herpes gestationalis (pemphigoid gestationis ) is characterized by eosinophilic degranulation at dermal-epidermal junction. Becomes severe with subsequent pregnancies.', 'role': 'assistant'}]