Which of the following statements is correct?

Options

A. AIDS is caused by a group of viruses called rhinovirus.
B. Acquired immunity is pathogen specific
C. The exaggerated response of the immune system to certain antigens present in the environment is called auto-immunity
D. Bone marrow acts as a filter of the blood by trapping blood bore micro-organisms

Answer

To determine which statement is correct, we will analyze each of the four statements provided:

1. **Statement 1**: "AIDS is caused by a group of virus called Rhinovirus."
- **Analysis**: This statement is incorrect. AIDS (Acquired Immunodeficiency Syndrome) is caused by the Human Immunodeficiency Virus (HIV), not Rhinovirus. Rhinovirus is responsible for causing the common cold.

2. **Statement 2**: "Acquired immunity is pathogen specific."
- **Analysis**: This statement is correct. Acquired immunity, also known as adaptive immunity, is indeed pathogen-specific. It involves the immune system's ability to recognize and remember specific pathogens, leading to a stronger response upon subsequent exposures.

3. **Statement 3**: "Exaggerated response of immune system to certain antigens present in environment is called autoimmunity."
- **Analysis**: This statement is incorrect. Autoimmunity refers to the immune system mistakenly attacking the body's own cells, not an exaggerated response to environmental antigens. An exaggerated response to environmental antigens is typically referred to as an allergy.

4. **Statement 4**: "Bone marrow acts as a filter of blood by trapping blood-borne microorganisms."
- **Analysis**: This statement is also incorrect. The primary function of bone marrow is to produce blood cells, including red blood cells, white blood cells, and platelets. The spleen, not the bone marrow, acts as a filter for blood, trapping microorganisms and old blood cells.

**Conclusion**: The only correct statement among the options is Statement 2: "Acquired immunity is pathogen specific."