Name the disease characterized by bloody stools and presence of tetranucleate cysts.

Explanation

**Step-by-Step Solution:**

1. **Identify the Symptoms**: The question states that the disease is characterized by bloody stools. This symptom is often associated with gastrointestinal infections or diseases that affect the intestines.

2. **Identify the Causative Agent**: The presence of tetranucleate cysts is a key detail. Tetranucleate cysts are a specific type of cyst that can be associated with certain protozoan infections.

3. **Link Symptoms to Disease**: The disease that matches both the symptom of bloody stools and the presence of tetranucleate cysts is caused by the protozoan *Entamoeba histolytica*. This organism is known to cause amoebic dysentery, which is characterized by bloody diarrhea.

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