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: Unknown
Aldosterone synthesis is stimulated by which of the following: 
Select and explain. 
A. ACTH, B. Hyperkalemia, C. Hypernatremia, D. Exogenous steroids
B: Hyperkalemia
Answer: B: Hyperkalemia 
Explanation: Ref. Guyton. 13th edition. Page. 969