Entamoeba histolytica is the organism known to form abscesses in various organs of the human body such as the liver, lungs, and brain. Here is a detailed explanation of why this is the correct answer:

Entamoeba histolytica:
- Entamoeba histolytica is a protozoan parasite that causes the disease amoebiasis.
- It is primarily transmitted through the ingestion of contaminated food or water.
- The parasite initially infects the large intestine, where it causes diarrhea, abdominal pain, and other gastrointestinal symptoms.
- In some cases, the parasite can invade the intestinal wall and enter the bloodstream, allowing it to spread to other organs.
- Once in the bloodstream, Entamoeba histolytica can reach the liver, lungs, brain, and other organs.
- In the liver, the parasite can cause the formation of abscesses, which are localized pockets of infected and inflamed tissue.
- Liver abscesses can lead to symptoms such as fever, abdominal pain, and an enlarged liver.
- If left untreated, the abscesses can rupture and spread the infection to other parts of the body.
- In addition to the liver, Entamoeba histolytica can also form abscesses in the lungs, brain, and other organs.
- These abscesses can cause a range of symptoms depending on the affected organ, including coughing, chest pain, headaches, and neurological deficits.

Other options:
- Moncystis: Moncystis is not a known organism that forms abscesses in human organs. It is not a recognized pathogen in humans.
- Plasmodium: Plasmodium is the parasite that causes malaria, a disease characterized by recurrent fever and other symptoms. While Plasmodium can cause damage to various organs, it does not typically form abscesses.
- Fasciola hepatica: Fasciola hepatica is a parasitic worm that infects the liver and bile ducts, causing a disease called fascioliasis. However, it does not form abscesses in the liver or other organs.

In conclusion, the correct answer is Entamoeba histolytica as it is the organism known to form abscesses in various organs of the human body, including the liver, lungs, and brain.