Correct Option: D

Tuberculosis (TB) is an infection caused by two species of Mycobacteria-"Mycobacterium tuberculosis and Mycobacterium Bovis". Though, it can cause disease involving every organ system in the body, it commonly affects the lungs. The disease was in existence even in the Neolithic period and till the early 20th century, the only treatment was rest in the open air in specialised sanitoria. Currently, around 1.7 billion people world-wide, a third of the world's population, are infected by Mycobacterium tuberculosis and 3 million deaths a year are attributable to tuberculosis.