<prompt> True about Ghons focus:Left apical parenchymal lesionRight apical parenchymal lesionSubpleural caseous lesion in right upper lobeSubpleural caseous lesion just above or below interlobar fissure.  <response>: Inhaled tubercule bacilli implanted in the distal air spaces of the lower pa of upper lobe or upper pa of lower lobe ,close to the pleura lead to formarion of ghons focus. Primary complex of tuberculosis consists of 3 components. Pulmonary compound Draining lymphnodes Caseating hilar lymphnode Caseous holar lymphadenopathy is associated with ghon complex and not ghon focus.ref Robbins 8th370,9e p374 