Which of the following is a non-infectious disease?

Options

A. AIDS
B. Tuberculosis
C. Cancer
D. Typhoid

Answer

To determine which of the following is a non-infectious disease, we will analyze each option provided.

### Step 1: Understand the definition of non-infectious diseases
Non-infectious diseases are conditions that cannot be transmitted from one person to another. They are often caused by genetic, environmental, or lifestyle factors.

**Hint:** Remember that non-infectious diseases are not contagious.

### Step 2: Analyze the first option - AIDS
AIDS (Acquired Immunodeficiency Syndrome) is caused by the HIV virus. It is a communicable disease that can be transmitted through blood and body fluids.

**Hint:** Consider how the disease spreads and whether it can be caught from another person.

### Step 3: Analyze the second option - Tuberculosis
Tuberculosis (TB) is caused by bacteria and is spread through the air when an infected person coughs or sneezes. It is also a communicable disease.

**Hint:** Think about how TB is transmitted and its mode of spread.

### Step 4: Analyze the third option - Cancer
Cancer is a group of diseases characterized by uncontrolled cell growth. It is not caused by infectious agents and cannot be transmitted from one person to another.

**Hint:** Consider whether cancer can be spread between individuals.

### Step 5: Analyze the fourth option - Typhoid
Typhoid fever is caused by the bacterium Salmonella typhi and is transmitted through contaminated food and water. It is a communicable disease.

**Hint:** Reflect on how typhoid is contracted and its contagious nature.

### Conclusion
After analyzing all the options, we find that the only non-infectious disease listed is cancer. Therefore, the correct answer is:

**Answer: Cancer (Option 3)**