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 pheumoniae, D. Haemophilus influenzae
C: Streptococcus pheumoniae
Answer: C: Streptococcus pheumoniae 
Explanation: Answer is C (Stretptococcus pneumonia): 'Streptococcus pneumonia or pneumococcus is the most common cause of community acquired acute pneumonia -Robbins 7th/748 Lobar pneumonia refers to an acute bacterial infection that results in consolidation of a large poion of a lobe or an entire lobe. Streptococcus pneumonia produces a picture of lobar pneumonia.