Okay, let's tackle this question. The question is about "interface dermatitis" and its histological feature. Hmm, interface dermatitis... I remember that term from dermatology. Interface dermatitis refers to a pattern of inflammation where the immune cells are located at the dermo-epidermal junction. So, which skin conditions show this pattern?

Let me think. Lichen planus comes to mind. Lichen planus is a T-cell mediated disorder that affects the skin and mucous membranes. The histology shows a band-like lymphocytic infiltrate at the interface between the epidermis and dermis. That's a classic feature of interface dermatitis. Also, conditions like lichen sclerosus or some drug reactions might show similar patterns, but lichen planus is the most classic.

Wait, what about other options? Let's see. If the options included psoriasis, that's more of a spongiotic or parakeratotic pattern. Eczema might have spongiosis. Lupus erythematosus can have interface dermatitis too, but it's more associated with the "interface" pattern in lupus. But lichen planus is more commonly cited for interface dermatitis. So if the correct answer is lichen planus, then the other options would be incorrect because they don't primarily present with interface dermatitis.

I need to make sure about the other options. Let's say the options are A. Psoriasis, B. Eczema, C. Lichen planus, D. Contact dermatitis. Then, the correct answer would be C. Lichen planus. Psoriasis has a different histology with acanthosis and parakeratosis. Eczema might have spongiosis. Contact dermatitis is eczematous, so spongiosis again. So interface dermatitis is key in lichen planus.

Wait, but there's also lupus erythematosus. The histology in lupus includes interface dermatitis with a band of lymphocytes and Civatte bodies. So maybe the answer is lupus? Wait, no, the question is about which condition's histological feature is interface dermatitis. Lichen planus and lupus both have interface dermatitis, but which is more commonly associated? I think lichen planus is the primary one. Let me check. Yes, lichen planus is a classic example of interface dermatitis. Lupus erythematosus is also a cause, but maybe the question is looking for the most common or the primary one. So if the options include both, then the answer would depend on the options given. But since the correct answer in the user's case is probably lichen planus. Let me confirm.

So the core concept here is that interface dermatitis is a histological pattern where lymphocytes are found at the dermo-epidermal junction, seen in conditions like lichen planus. The correct answer is lichen planus. The other options are incorrect because they don't present with interface dermatitis as their primary histological feature.

**Core Concept**
Interface dermatitis is a histological pattern characterized by a band-like lymphocytic infiltrate at the dermo-epidermal junction. It occurs in T-cell mediated disorders like lichen planus, where immune cells attack the basement membrane zone.

**Why the Correct Answer is Right**
Lichen plan

✓ Correct Answer: B. Lichen planus