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: Pharmacology
β-blocker with additional α-blocking property is 
Select and explain. 
A. Propranolol, B. Timolol, C. Metoprolol, D. Labetalol
D: Labetalol
Answer: D: Labetalol 
Explanation: None