Ans. B. Patient is likely to be immunocompromised* Its typical bilateral perihilar consolidation and Reticulo nodular interstitial involvement, typical of PCP.* Mycoplasma infection not likely as mycoplasma radiographically produces fluffy opacities and those infiltrations of mycoplasma are not Perihilar. It is not likely to be sarcoidosis, as there is no hilar adenopathy (the shadows near hilum seen parenchymal perihilar opacities).* IN a young boy, generally no occupation causes such ILD or a DLD, so occupational details may not help much.