This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
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: Ans. is 'c' i.e., Streptococcus pneumoniae* Most common cause of lobar pneumonia: Pneumococcus.* Most common cause of acute sinusitis: Pneumococcus.* Most common cause of adult meningitis: Pneumococcus.* Most common cause of atypical pneumonia: Mycoplasma pneumoniae.* Most common infection of pneumococcus: Otitis media.