**Core Concept**
Baer's syndrome, also known as renal artery stenosis syndrome, is a clinical entity characterized by the triad of hypertension, renal impairment, and a characteristic bruit over the renal arteries. This syndrome is often associated with atherosclerotic or fibromuscular dysplastic stenosis of the renal arteries.

**Why the Correct Answer is Right**
The combination of hypertension, renal impairment, and a bruit over the renal arteries is a classic triad of Baer's syndrome. The bruit is a result of turbulent blood flow through the stenotic renal arteries, which can be auscultated over the affected area. Renal impairment occurs due to reduced blood flow to the kidneys, leading to decreased glomerular filtration rate and increased blood pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not a feature of Baer's syndrome. The syndrome is not typically associated with cardiac arrhythmias.
**Option B:** This option is incorrect because Baer's syndrome is indeed characterized by renal impairment, which can manifest as decreased urine output, increased serum creatinine, or a decreased glomerular filtration rate.
**Option C:** This option is not a feature of Baer's syndrome. The syndrome is not typically associated with a specific type of skin rash.
**Option D:** This option is incorrect because Baer's syndrome is indeed characterized by a bruit over the renal arteries, which is a result of turbulent blood flow through the stenotic renal arteries.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of Baer's syndrome is the presence of a bruit over the renal arteries, which can be auscultated using a stethoscope. This bruit is a result of turbulent blood flow through the stenotic renal arteries and is a characteristic feature of this syndrome.

**Correct Answer:** D.