**Core Concept**
Amoebic lung abscess is a complication of amoebiasis, caused by the protozoan parasite Entamoeba histolytica. The liver is the primary site of amoebic infection, and the parasite can spread to other organs, including the lungs.

**Why the Correct Answer is Right**
The correct answer is direct spread from the liver because the liver is the primary site of amoebic infection. When the liver is infected, the parasite can spread to the lungs through direct extension, either through the diaphragm or through the bloodstream. This is the most common mechanism of amoebic lung abscess formation. The parasite can also spread to the lungs through the bloodstream, but this is a less common route.

**Why Each Wrong Option is Incorrect**
**Option A:** Aspiration is a common cause of bacterial lung abscesses, but it is not a common cause of amoebic lung abscesses. Amoebic lung abscesses are typically caused by the spread of the parasite from the liver.

**Option B:** Hematogenous spread from the liver is a less common route of amoebic lung abscess formation. While it is possible for the parasite to spread to the lungs through the bloodstream, this is not the most common mechanism.

**Option C:** Hematogenous spread from the gut is not a common route of amoebic lung abscess formation. The parasite typically spreads to the lungs through direct extension from the liver, rather than through the bloodstream from the gut.

**Clinical Pearl / High-Yield Fact**
Amoebic lung abscesses can be difficult to diagnose, but they often present with symptoms such as fever, cough, and chest pain. Imaging studies, such as chest X-rays or CT scans, can help confirm the diagnosis. Treatment typically involves antiparasitic medications, such as metronidazole.

**✓ Correct Answer: B. Direct spread from liver**