<prompt> Ghons focus lies at ?Left apical parenchymal regionRight apical parenchymal regionSub pleural caesous lesion in right upper lobeSub pleural caesous lesion in left upper lobe  <response>: Ans. is c i.e., Right apical parenchymal regionPrimary T.B. includes :?An area of grey white size of approx. 1-1.50 cm inflammatory consolidation - called ghons focus. o Lymph node.Lymphatics and lymphatic channel.Cavity and fibrosis is seen in secondary T.B.Inhaled tubercule bacilli implanted in the distal air spaces of the lower pa of upper lobe or upper pa of the lower lobe, close to the pleura. This area is about 1 to 1.5 cm with caseating necrosis known as Ghons focus.Primary complex or Ghons complex of tuberculosis consists of 3 components :Pulmonary compound or Ghons focus.Draining lymphaticsCaseating hilar lymphnodeAssmans focusThe initial lesion in secondary tuberculosis at the apex of lung infraclavicular without any lymph node involvement is called Assmans focus.Ghons complexThe initial lesion in primary tuberculosis at the periphery of the lung along with the enlarged peribronchial lymph node is called Ghons complex. 