**Core Concept**
Kartagener syndrome is a rare genetic disorder characterized by the triad of situs inversus, chronic sinusitis, and bronchiectasis. It is caused by mutations in the DNAI1 or DNAH5 genes, which encode for dynein heavy chain proteins essential for ciliary function. This leads to impaired ciliary motility and subsequent respiratory and sinus complications.

**Why the Correct Answer is Right**
Kartagener syndrome is a classic example of primary ciliary dyskinesia (PCD), a condition where the cilia lining the respiratory tract and other organs are dysfunctional due to genetic mutations. The impaired ciliary function leads to the accumulation of mucus and debris, causing chronic sinusitis and bronchiectasis. Situs inversus, a condition where the internal organs are reversed, is also a common feature of Kartagener syndrome.

**Why Each Wrong Option is Incorrect**
* **Option A:** While chronic sinusitis is a hallmark of Kartagener syndrome, it is not the only feature. However, there is not enough information provided to determine if this is the correct answer.
* **Option B:** Bronchiectasis is a common feature of Kartagener syndrome and is caused by the impaired ciliary function. However, the question is asking for an exception, so this option might not be the correct answer.
* **Option C:** Situs inversus is a common feature of Kartagener syndrome and is caused by the same genetic mutations that affect ciliary function. This option is likely to be incorrect.

**Clinical Pearl / High-Yield Fact**
Kartagener syndrome is a classic example of a genetic disorder that affects ciliary function, leading to respiratory and sinus complications. It is essential to recognize the triad of situs inversus, chronic sinusitis, and bronchiectasis in patients with Kartagener syndrome.

**Correct Answer: D.**