Final answer:
The influenza virus, parainfluenza virus, and Mycoplasma can all cause pneumonia.
Step-by-step explanation:
Influenza and Pneumonia
The influenza virus, parainfluenza virus, and Mycoplasma can all cause pneumonia.
Influenza is caused by types A and B of the influenza virus. It primarily affects the upper respiratory tract but can also extend into the lower respiratory tract, causing pneumonia.
Pneumonia is an infection of the alveoli in the lungs, often caused by various viruses and bacteria. It can result in fluid accumulation in the alveoli and reduce the lungs' ability to exchange gases.
Therefore, the correct answer to the question is D) Pneumonia.