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
A 56-year-old African-American man with COPD comes to the physician for a routine examination. His average diurnal ambulatory blood pressure is 148/92 mmHg. Laboratory studies show creatinine level of 3.2 mg/dL and a potassium level of 5.6 mg/dL. 
Which of the following medications would most likely be considered the first-line treatment in this patient? 
Select and explain. 
A. Amlodipine, B. Doxazosin, C. Propranolol, D. Pamipril
A: Amlodipine
Answer: A: Amlodipine 
Explanation: None