Which of the following conditions allows for the potential spread of tuberculosis?

The potential spread of tuberculosis (TB) is primarily linked to inhalation of infectious droplets that are expelled when an infected person coughs, sneezes, or talks. These droplets can remain suspended in the air for extended periods, allowing others to inhale them, which is a significant mode of transmission for the disease.

In this context, inhalation and contact with lesions are key factors because TB is primarily transmitted through the air, rather than through surfaces or skin contact. Although contact with lesions could be a consideration in specific circumstances—such as direct interaction with infected bodily fluids—it's the inhalation of airborne particles that constitutes the primary risk for spreading TB.

Moreover, exposure to contaminated surfaces, skin absorption, or heated air does not effectively contribute to the transmission of tuberculosis in the way that inhalation of infectious droplets does. Recognizing this primary method of transmission is essential for understanding how TB spreads and for implementing appropriate infection control measures.