Which of the following is a protozoan disease?

Options

A. Malaria
B. Amoebiasis
C. Sleeping sickness
D. All of these

Explanation

To determine which of the following is a protozoan disease, we will analyze each option provided:

### Step 1: Analyze Option A - Malaria
- **Definition**: Malaria is a disease caused by a protozoan parasite.
- **Causative Agent**: It is caused by *Plasmodium falciparum*, which is a protozoan.
- **Symptoms**: Common symptoms include fever, chills, headache, and in severe cases, it can lead to complications such as jaundice and can be life-threatening.
- **Conclusion**: Malaria is a protozoan disease.

### Step 2: Analyze Option B - Amoebiasis
- **Definition**: Amoebiasis is an infection of the gastrointestinal tract.
- **Causative Agent**: It is caused by the protozoan *Entamoeba histolytica*.
- **Symptoms**: Symptoms include diarrhea, stomach pain, cramping, and fever.
- **Conclusion**: Amoebiasis is also a protozoan disease.

### Step 3: Analyze Option C - Sleeping Sickness
- **Definition**: Sleeping sickness, also known as African sleeping sickness, is a disease caused by a parasite.
- **Causative Agent**: It is caused by the protozoan *Trypanosoma brucei*.
- **Symptoms**: Early symptoms include fever, headache, and joint pain, while late-stage symptoms can involve behavioral changes and confusion.
- **Conclusion**: Sleeping sickness is a protozoan disease.

### Step 4: Analyze Option D - All of These
- Since we have established that Malaria, Amoebiasis, and Sleeping Sickness are all caused by protozoan parasites, we can conclude that:
- **Conclusion**: The correct answer is option D - All of these are protozoan diseases.

### Final Answer
The correct answer is **Option D: All of these**.

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