Which of the following is infectious diseaseA Cancer B AIDS C Allergy D Hypertension

To determine which of the options is an infectious disease, we need to understand the nature of each option.

A. Cancer: Cancer is not an infectious disease. It is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body. It is caused by genetic mutations and environmental factors, but it is not contagious.

B. AIDS: AIDS stands for Acquired Immunodeficiency Syndrome. It is caused by the Human Immunodeficiency Virus (HIV), which is transmitted through certain body fluids, such as blood, semen, vaginal fluids, and breast milk. AIDS weakens the immune system, making individuals more susceptible to infections and other diseases. Therefore, AIDS is an infectious disease.

C. Allergy: Allergies are not infectious diseases. They occur when the immune system overreacts to substances that are usually harmless, such as pollen, dust mites, or certain foods. Allergies are not contagious and cannot be transmitted from one person to another.

D. Hypertension: Hypertension, also known as high blood pressure, is not an infectious disease. It is a chronic condition characterized by elevated blood pressure in the arteries. Hypertension can be caused by various factors, including genetics, lifestyle choices, and underlying health conditions. It is not contagious and cannot be transmitted from person to person.

Based on the information provided, the only option that is an infectious disease is B. AIDS.