Okay, let's tackle this question. The user is asking about solar urticaria, and the question is a "which is an exception" type. First, I need to recall what solar urticaria is. It's a skin condition where exposure to sunlight causes hives or wheals. The key here is to identify the statement that's not true about this condition.

The core concept here would be the pathophysiology of solar urticaria. It's an IgE-mediated response to UV or visible light. When the skin is exposed to sunlight, it triggers mast cell degranulation, releasing histamine and other mediators, leading to the urticarial reaction. So, the correct answer should be something that contradicts this mechanism.

Now, looking at the options, even though they are labeled A to D without text, I need to think of possible incorrect statements. Common misconceptions might include the type of light involved, the duration of symptoms, or treatment approaches. For example, if an option states that it's caused by UVB only, that might be incorrect because solar urticaria can be triggered by UVA, UVB, or even visible light. Another incorrect option could be that it's a non-allergic reaction, which would be wrong because it's IgE-mediated.

The wrong options might also mention that symptoms last for days, which isn't true since urticaria typically resolves within hours. Another possible incorrect statement could be about treatment; for example, saying corticosteroids are first-line, when in fact antihistamines are the mainstay.

The clinical pearl here is to remember that solar urticaria is an IgE-mediated photodermatosis, and management includes avoiding triggers and using antihistamines. Also, photoprotection is crucial. The exception in the question would be the statement that contradicts these facts.

**Core Concept**
Solar urticaria is a **photodermatosis** triggered by sunlight (UV or visible light), mediated by **IgE antibodies** against photoallergens or photolabile compounds. It causes **urticarial wheals** within minutes of exposure, resolving within hours. Diagnosis involves **photopatch testing** or **phototesting**.

**Why the Correct Answer is Right**
Solar urticaria is **IgE-mediated**, with mast cell degranulation upon light exposure. The reaction occurs **within minutes** of UV/visible light exposure, peaks in 1–2 hours, and resolves **within 24 hours**. Treatment includes **antihistamines**, **photoprotection**, and **phototherapy** (not corticosteroids, which are ineffective for IgE-mediated reactions).

**Why Each Wrong Option is Incorrect**
**Option A:** If claiming solar urticaria is caused by UVB only, it’s incorrect—**UVA, UVB, and visible light** can trigger it.
**Option B:** If stating symptoms last >24 hours, it’s wrong—**resolution occurs within hours**, distinguishing it from delayed photodermatoses.
**Option C:** If suggesting corticosteroids are first-line, it’s incorrect—**H1-antihistamines** are primary therapy.
**Option D:** If asserting it’s non-IgE mediated, it’s false—**IgE plays a central role**, confirmed

✓ Correct Answer: A. Common in females between age group above 40 yrs