Answer:
C) pneumocystic pneumonia.
Step-by-step explanation:
It's worth mentioning that there is a slight discrepancy in the provided options, as pneumocystic pneumonia is typically caused by a fungal pathogen (Pneumocystis jirovecii) and not by Gram-positive diplococci. However, among the given options, pneumocystic pneumonia is the closest match as it includes the term "pneumonia" and is caused by an infectious agent.