Which of the following statements correctly describes Entamoeba histolytica?

• A. It is a Gram-positive bacterium responsible for tuberculosis.
• B. It is a protozoan parasite that causes amoebic dysentery by invading the intestinal mucosa.
• C. It is a helminth that causes schistosomiasis.
• D. It is a virus that leads to hepatitis B infection.

Answer: (B)

Verified step by step guidance

1. Identify the classification of Entamoeba histolytica by understanding its biological nature. It is important to know whether it is a bacterium, protozoan, helminth, or virus.
2. Recall that Entamoeba histolytica is a protozoan parasite, which means it is a single-celled eukaryotic organism, not a bacterium, helminth, or virus.
3. Understand the disease caused by Entamoeba histolytica: it invades the intestinal mucosa and causes amoebic dysentery, characterized by severe diarrhea and tissue damage.
4. Eliminate incorrect options by matching the organism type and disease: it is not a Gram-positive bacterium (which would be a type of bacteria), not a helminth (parasitic worm), and not a virus.
5. Conclude that the correct description is that Entamoeba histolytica is a protozoan parasite causing amoebic dysentery by invading the intestinal mucosa.