<prompt> Ghons focus is found inLeprosyPulmonary tuberculosisSarcoidosisAsbestosis  <response>: Ghons focusIn primary tuberculosis when inhaled tubercule bacilli implanted in the distal air spaces of the lower part of an upper lobe or upper part of the lower lobe, close to the pleura. This area is about 1 to 1.5 cm with caseating necrosis known as Ghons focus.Ghons focus is one of the components of Ghons complex primary complex, which consists of 3 components: -i Ghons focus subpleural caseating lesionii Caseating hilar lymph nodeiii Draining lymphatics. Note - Due to early bacteremia bacillemia seeding of tubercle bacilli may occur at the apex to produce Simons focus. 