A 60-year-old man presents to the clinic complaining of light headedness,chest distress and palpitation for 3 months. If the patient's blood pressure is 165/100 mmHg,which of following should his blood pressure be classified into?
选项：

A:High-normal blood pressure
B:Hypertension of grade 1
C:Hypertension of grade 2
D:Hypertension of grade 3
E:Isolated systolic hypertension