This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Interstitial Lung Disease, Subject name: Radiology
Miliary mottling in lung seen in - 
Select and explain. 
A. Histiocytosis X, B. Metastasis, C. Mitral stenosis, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e.. All of the above Causes of Miliary mottlingInfection Bacterial (TB, Brucellosis. Bronchopneumonia, Melioidosis), viral (varicella / chicken pox), Fungal (Histoplasmosis, Coccidiodomycosis, blastomycosis, cryptococcosis).Cardiac Mitral stenosis. Pulmonary edema, multiple pulmonary infarct.Pneumoconiosis Coal worker pneumoconiosis, silicosis.Neoplastic Lymphangitis carcinomatosis, alveolar cell Ca., lymphoma, leukemia, metastasis.Allergic Loeffler's syndrome, tropical eosinophilia.Others IPF, RA, Sarcoidosis, Histocytosis-X, HMD, Haemosiderosis.