**Core Concept**
Aspirin-sensitive asthma, also known as aspirin-exacerbated respiratory disease (AERD), is a severe form of asthma triggered by the ingestion of nonsteroidal anti-inflammatory drugs (NSAIDs), including aspirin. This condition is characterized by the presence of chronic rhinosinusitis, nasal polyps, and bronchial hyperresponsiveness.

**Why the Correct Answer is Right**
Aspirin-sensitive asthma is caused by a deficiency in the enzyme cyclooxygenase-1 (COX-1), which is responsible for the production of prostaglandins, particularly prostaglandin E2 (PGE2). PGE2 has protective effects on the airway epithelium, and its deficiency leads to an imbalance in the arachidonic acid pathway, resulting in increased levels of leukotrienes, which are potent bronchoconstrictors. This leads to the characteristic symptoms of aspirin-sensitive asthma, including bronchospasm, nasal congestion, and rhinorrhea.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is not directly related to aspirin-sensitive asthma. While chronic rhinosinusitis is a common feature of AERD, the underlying pathophysiology is more complex and involves the imbalance of eicosanoids.

**Option B:**
This option is incorrect because corticosteroids are the primary treatment for aspirin-sensitive asthma, not the underlying cause. Corticosteroids help to reduce inflammation and prevent exacerbations.

**Option C:**
This option is not accurate because aspirin-sensitive asthma is not simply a result of a genetic predisposition. While there may be a familial component, the underlying pathophysiology involves the complex interplay of eicosanoids and the imbalance of the arachidonic acid pathway.

**Clinical Pearl / High-Yield Fact**
The key to diagnosing aspirin-sensitive asthma is the patient's history of worsening respiratory symptoms after taking NSAIDs, including aspirin. A simple test to diagnose AERD is the oral aspirin challenge, which involves administering a gradually increasing dose of aspirin to the patient while monitoring their respiratory symptoms.

**Correct Answer:** D.