This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
The most common cause of malignant adrenal mass is 
Select and explain. 
A. Adrenocoical carcinoma, B. Malignant phaeochromocytoma, C. Lymphoma, D. Metastasis from another solid tissue tumor
D: Metastasis from another solid tissue tumor
Answer: D: Metastasis from another solid tissue tumor 
Explanation: Ans. is 'd' i.e., Metastasis from another solid tissue tumor The most common cause of adrenal tumors is metastasis from another solid tumor like breast cancer and lung cancer. Malignant Percentage Adrenocoical carcinoma 2-5% Malignant pheochromocytoma <I% Adrenal neuroblastoma <0- 1% Lymphomas (incl. primary adrena lymphoma) <1% Metastases (most frequent : Breast, lung) 15%