Answer:
The correct answer is pneumonia.
Step-by-step explanation:
The elderly suffering from pneumonia makes them susceptible to various other issues. Due to its rapid occurrence and tendency to disperse to other sections of the body, pneumonia can be lethal. Even a mild case of pneumonia results in an extreme blow to the immune system that can cause an underlying condition like a heart condition into a life-threatening problem.
As older individuals generally possess these additional issues, any kind of pneumonia can possess dangerous consequences.