Mr R R. Aged 47 yrs is a conductor in a Govt. Transport Corporation  at Hyderabad .,who has to do duties in 3 shifts by rotation. His Diabetes is well controlled by Glibenclamide 5 mg twice daily Corporation Physician  on routine check recorded his BP --160/102 during 3 visits. Pl select the most appropriate Antihypertensive with reasoning.

Propranolol. Clonidine. Enalapril . Hydrochlorthiazide . Atenalol H