This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
The most common causative organism for lobar pneumonia is - 
Select and explain. 
A. Staphylococcus aureus, B. Streptococcus pyogenes, C. Streptococcus pneumoniae, D. Haemophilus influenzae
C: Streptococcus pneumoniae
Answer: C: Streptococcus pneumoniae 
Explanation: None