Psoriasis Vulgaris is associated with
The options aren't given, but from the correct answer being "C. HLA-B13 and HLA-B17" (assuming that's the case since the user didn't specify), I need to verify if those HLA types are indeed associated with psoriasis. Wait, actually, I think the correct HLA associations for psoriasis vulgaris are HLA-Cw6. Let me check that. Oh, right, HLA-Cw6 is a major genetic risk factor. HLA-B27 is more associated with psoriatic arthritis and ankylosing spondylitis. So maybe the options included HLA-B27, but the correct answer is HLA-Cw6. Wait, the user's correct answer is C, but I need to make sure which options were given. Since the user didn't provide the actual options, maybe I should proceed with the standard associations.
Wait, the user's correct answer line is empty. But in their example, the correct answer was labeled with a letter and text. Since the user's correct answer is missing, perhaps there's a mistake here. Let me think again. The user provided a question and a correct answer, but the options and correct answer text are missing. Hmm, maybe the user intended to have an example where the correct answer is C, but the options were not provided. Since the user's example has the correct answer as "C. HLA-B13 and HLA-B17", but that's incorrect. Wait, no, the standard HLA for psoriasis is HLA-Cw6. So maybe the correct answer in the example is C, but the options given in the user's question are not shown. This is confusing. Let me try to structure the explanation based on standard knowledge.
Core Concept: Psoriasis Vulgaris is associated with specific HLA alleles, particularly HLA-Cw6. The HLA system is part of the immune system and plays a role in genetic predisposition to autoimmune diseases.
Why Correct Answer is Right: The correct answer (assuming it's HLA-Cw6) is because HLA-Cw6 is a well-documented genetic marker for psoriasis. It's involved in presenting antigens to T-cells, leading to the immune response that causes psoriatic plaques.
Why Wrong Options are Incorrect: If the options included HLA-B27, that's associated with psoriatic arthritis. HLA-DR4 might be linked to other conditions. HLA-B13 and B17 might be distractors with no known association.
Clinical Pearl: Remember that HLA-Cw6 is the key HLA type for psoriasis, and HLA-B27 is for psoriatic arthritis. This distinction is crucial for differential diagnosis.
Correct Answer: C. HLA-Cw6
**Core Concept**
Psoriasis Vulgaris is a chronic inflammatory skin disease linked to immune dysregulation and specific human leukocyte antigen (HLA) associations. The **HLA-Cw6** allele is the strongest genetic