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: Dental
Epidermal Bullosa Acquisita is characterized by 
Select and explain. 
A. Immunoglobulins against collagen 7, B. IgA against BP2, C. Immunoglobulins against BP2, D. Immunoglobulins against Dsg-1
A: Immunoglobulins against collagen 7
Answer: A: Immunoglobulins against collagen 7 
Explanation: Epidermal Bullosa Acquisita : Immunoglobulins against collagen 7
Epidermal Bullosa Dystrophica : absence of collagen 7