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
Steven-Johnson syndrome involves 
Select and explain. 
A. Type I hypersensitivity reaction, B. Type II hypersensitivity reaction, C. Type III hypersensitivity reaction, D. Type IV hypersensitivity reaction
C: Type III hypersensitivity reaction
Answer: C: Type III hypersensitivity reaction 
Explanation: Both erythema multiformae and steven Johnson syndrome are due to deposition of immune complexes in the superficial microvasculature of skin and mucosa. These immune complex diseases are mediated through type III hypersensitivity reaction.