## **Core Concept**
Aspirin-sensitive asthma, also known as aspirin-exacerbated respiratory disease (AERD), is a condition where patients with asthma experience worsening symptoms after ingesting aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs). This condition is closely linked to abnormalities in arachidonic acid metabolism.

## **Why the Correct Answer is Right**
The correct answer, C. CysLT1 receptor antagonists are used in treatment, is right because AERD involves an overproduction of cysteinyl leukotrienes, which are potent bronchoconstrictors. These leukotrienes act through the CysLT1 receptor, leading to bronchospasm and inflammation. CysLT1 receptor antagonists, such as montelukast, are used as part of the treatment strategy for AERD because they block the action of cysteinyl leukotrienes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while asthma involves airway inflammation and bronchospasm, AERD is specifically related to abnormalities in arachidonic acid metabolism leading to an overproduction of leukotrienes, not just any inflammatory process.
- **Option B:** This option is incorrect as there is no widely recognized association of aspirin-sensitive asthma with a deficiency of a specific enzyme that leads to increased prostaglandins; instead, it's related to the shunting of arachidonic acid towards leukotriene production.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that patients with AERD often have a triad of asthma, chronic rhinosinusitis with nasal polyps, and sensitivity to aspirin and other NSAIDs. The use of CysLT1 receptor antagonists can be particularly beneficial in managing this condition.

## **Correct Answer:** . CysLT1 receptor antagonists are used in treatment