This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Streptococci, Subject name: Microbiology
Most common organism causing community acquired pneumonia - 
Select and explain. 
A. Staphylococcus aureus, B. Streptococcus pyogenes, C. Streptococcus pneumoniae, D. Haemophilus influenzae
C: Streptococcus pneumoniae
Answer: C: Streptococcus pneumoniae 
Explanation: Ans. is 'c' i.e., Streptococcus pneumoniae o Streptococcus pneumoniae is the most common cause of community acquired acute pneumonia. It is the most common cause of lobar pneumonia.