The correct answer is option 1, Tuberculosis. Tuberculosis is a disease caused by bacteria called Mycobacterium tuberculosis. This bacterium primarily attacks the lungs, but it can also affect other parts of the body. Tuberculosis spreads through the air when an infected person coughs or sneezes, and it can be transmitted to others who come into close contact with the infected person. Tuberculosis is a contagious disease and can lead to symptoms such as cough, weight loss, fatigue, fever, and night sweats. It is important to note that options 2, 3, and 4 (Common-cold, AIDS, and Dengue fever) are not caused by bacteria but by other factors - common-cold is caused by different types of viruses, AIDS is caused by the human immunodeficiency virus (HIV), and Dengue fever is caused by a virus transmitted by mosquitoes.