This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
HLA* 1502 is a genetic marker of 
Select and explain. 
A. SLE, B. Polyaeritis nodosa, C. Steven Johnson syndrome, D. Seronegative spondyloahritis syndrome
C: Steven Johnson syndrome
Answer: C: Steven Johnson syndrome 
Explanation: The HLA allele B*1502 as a marker for carbamazepine-induced Stevens-Johnson syndrome and toxic epidermal necrolysis .This allele is seen in high frequency in many Asian populations other than Han Chinese, but there are few data on whether the allele is a marker for this severe outcome in anyone other than Han Chinese. In fact, the association has not been found in Caucasian patients. Carbamazepine is an impoant treatment for seizure disorders, bipolar disorder, trigeminal neuralgia and chronic pain. However, carbamazepine is also associated with hypersensitivity reactions that range from benign uicaria to life-threatening cutaneous disorders, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) . Ref - harrison's internal medicine 20e p368