Which statement regarding Stevens-Johnson syndrome is true?
A. It presents with severe ocular blistering, scarring may occur, similar to that in bullous pemphigoid.
B. The etiology is usually a result of an acute infection rather than a drug reaction
C. For a diagnosis to be made, either the ocular or genital mucosa should be affected in conjunction with the oral and skin lesions.
D. A less severe form of erythema multiforme and has an acute onset
E. All of the above are true