Correct Option: A  [ Swine flu ]
Remark:
Swine Flu is caused by the H1N1 virus, a subtype of the Influenza A virus. It primarily affects the respiratory system and is transmitted from person to person through droplets from coughs or sneezes. Symptoms include fever, cough, sore throat, body aches, and fatigue. The H1N1 pandemic in 2009 was declared a global health emergency by the World Health Organization (WHO).
Other options (for context)
- Dengue: Caused by the Dengue virus, transmitted by Aedes mosquitoes.
- AIDS: Caused by the HIV (Human Immunodeficiency Virus), not H1N1.
- Bird flu: Caused by the H5N1 virus, not H1N1.