**Core Concept**
Hydatid cysts in the liver are a type of parasitic infection caused by Echinococcus granulosus, leading to the formation of a cystic structure that can cause various complications due to its location and growth.

**Why the Correct Answer is Right**
The liver is a vital organ responsible for detoxification, metabolism, and production of bile. A hydatid cyst in the liver can cause complications such as rupture, secondary infection, and compression of surrounding structures like bile ducts and blood vessels. Additionally, the cyst can cause an allergic reaction, leading to anaphylaxis, and can also erode into nearby organs like the gallbladder and diaphragm.

**Why Each Wrong Option is Incorrect**
**Option A:** Rupture of the cyst is a known complication of hydatid cyst in the liver. When the cyst ruptures, it can release its contents, leading to anaphylaxis and potentially life-threatening complications.

**Option B:** Secondary infection of the cyst is another potential complication of hydatid cyst in the liver. This can occur due to bacterial invasion of the cyst, leading to abscess formation and potentially spreading to other parts of the body.

**Option C:** Compression of nearby structures like bile ducts and blood vessels is a common complication of hydatid cyst in the liver. This can lead to obstructive jaundice, ascites, and other symptoms.

**Clinical Pearl / High-Yield Fact**
A classic complication of hydatid cyst in the liver is the formation of a "daughter cyst," which is a smaller cyst that forms within the larger cyst. This is due to the parasitic nature of the infection and can lead to further complications.

**Correct Answer: D.**