<prompt> Most common causative organism for lobar pneumonia is -Staphylococcus aureusStreptococcus pyogenesStreptococcus pneumoniaeHaemophilus influenzae  <response>: Streptococcus pneumoniae is the Most common causative organism for lobar pneumoniaAdult: MC serotype associated: Type 1-8Children: Type 6, 14, 19, 23 are frequently associated serotypesMost Virulent: Type 3.Ref: Apurba Sastrys Essentials of Medical Microbiology 1e p233 , Ananthanarayan 9e p222 