<prompt> Commonest cause of lung abscess -AspirationHematogenous spread from distant siteDirect contactLymphatic spread  <response>: Routes of infection to lungAspiration of organisms that colonize the oropharynx MCInhalation of infections, aerosolsHematogenous dissemination from an extrapulmonary site.Direct inoculation as in tracheal intubation or stab woundsContiguous spread from an adjacent site of infection. 