Tuberculosis is quite common among
Tuberculosis is an infectious disease usually caused by Mycobacterium tuberculosis bacteria. Tuberculosis generally affects the lungs, but can also affect other parts of the body. TB is common among undernourished people because it results in increased severity and frequency of disease. It is also common among people living in overcrowded areas i.e., dingy urban localities. So, the correct answer is 'Both A and B'.