question: A 54-year man with 5-day history of productive cough of green sputum, fever and feeling malaise . Bronchial breathing in the left lower zone seen . What is the most likely causative organism?
opa: Mycoplasma pneumoniae
opb: Klebsiella pneumoniae
opc: Staphlococcus aureus
opd: Streptococcus pneumoniae