True regarding presentation of primary T.B. is :

Ans is 'b' ie Unilateral hilar lymphadenopathy Pleural effusion occurs in T.B. as a result of penetration of a few tubercle bacilli into the pleural space from an adjacent subpleural focus. Therefore pleural effusion is usually unilateral because the lesion in T.B. is also unilateral (so the tubercle bacilli will reach the pleura of the involved lung only)Tuberculosis is invariably accompanied by involvement of the hilar or mediastinal lymph nodes.