**Core Concept**
Kerley B lines are short, horizontal lines at the lung periphery, seen on chest radiographs. They are indicative of interstitial lung edema, which can be caused by various conditions, including cardiogenic pulmonary edema, congenital heart disease, and other interstitial lung diseases.

**Why the Correct Answer is Right**
Kerley B lines are formed due to the interstitial edema caused by the accumulation of fluid in the lung interstitium. This can occur in conditions where there is an increase in pulmonary capillary pressure, such as in cardiogenic pulmonary edema (A). Congenital heart disease (B) can also lead to increased pulmonary capillary pressure due to left-to-right shunting of blood, resulting in interstitial edema and Kerley B lines. Sarcoidosis (C) can cause interstitial lung disease, leading to inflammation and fibrosis in the lung interstitium, which can also result in Kerley B lines. Therefore, Kerley B lines can be seen in all of the above conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** While Kerley B lines are indeed seen in pulmonary edema, this option does not account for the other two conditions where Kerley B lines can also occur.

**Option B:** While congenital heart disease can cause Kerley B lines, this option does not account for the other two conditions where Kerley B lines can also occur.

**Option C:** While sarcoidosis can cause interstitial lung disease leading to Kerley B lines, this option does not account for the other two conditions where Kerley B lines can also occur.

**Clinical Pearl / High-Yield Fact**
Kerley B lines are a classic radiographic sign of interstitial lung edema, and their presence should prompt further investigation into the underlying cause of pulmonary congestion.

**✓ Correct Answer: D. All of the above**