All are features of Silico-tuberculosis except: (A) High sputum AFB +ve, (B) Children of such cases do not get disease, (C) Impairement of total lung, (D) Nodular fibrosis
Answer is A. In recent years doubts have risen in the association between silicois and tuberculosis as:

Sputum is rarely AfB+
Children and women of sts do not develop tuberculosis
Post mortem of sts fail to prove existence of tuberculosis
Radilogical evidence of both conditions is similar.