A 50 year old patient, male. Chief complaint: dizziness for 5 days. Physical examination: bp165 / 95mmhhg. The breath sounds of both lungs were normal. The heart rate was 58 BPM, and the second heart sound in aortic valve area was enhanced. No other exception found. History: 3 years of type 2 diabetes mellitus, usually treated with metformin. Blood test: blood glucose 7.2mmol/l, urine protein (-). Question: (1)What is the traget blood pressure of this patient? Why? (2)How to choose antihypertensive drugs for this patient?And give the brief reason,please.