This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Tumour associated with primary aldosteronism - 
Select and explain. 
A. Adrenal adenoma, B. Adrenal hyperplasia, C. Von Hippel-Lindau syndrome, D. Adrenal carcinoma
A: Adrenal adenoma
Answer: A: Adrenal adenoma 
Explanation: in most cases involve unilateral adenoma which is usually sma and may occur on either side( Harrison 17 pg 2260 )