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: Pathology
IgA deposits in dermal papilla are characteristically seen in? 
Select and explain. 
A. A. Dermatitits herpetiformis, B. B. Pemphigus vulgaris, C. C. Bullous pemphigoid, D. D. IgA dermatosis of childhood
A: A. Dermatitits herpetiformis
Answer: A: A. Dermatitits herpetiformis 
Explanation: A. Dermatitits herpetiformisDermatitits herpetiformis is diagnosed by a blood test for IgA antibodies, and by a skin biopsy in which the pattern of IgA deposits in the dermal papillae, revealed by direct immunofluorescence, distinguishes it from linear IgA bullous dermatosis and other forms of dermatitis.