<prompt> True about miliary tuberculosisOccurs following primary reactivationOccurs following secondary reactivationBoth primary and secondary reactivationAll  <response>: Military TB is due to hematogenous spread of tubercle bacilli.Although in children,it is often the consequence of primary infection,in adults,it may be due to either recent infection or reactivation of old disseminated foci.The lesions are usually yellowish granulomas 1--2 mm in diameter that resemble millet seeds Reference: Davidson edition23rd pg 589 