Correct answer is (d) Need further studies
The explanation is: 1st line treatment should continue with lifestyle modification, initial drug selection should be diuretic, beta-blocker. If inadequate, continue to second-line treatment which includes adding drugs such as Angiotensin Converting Enzyme (ACE) Inhibitor, Calcium Channel Blocker, Angiotensin II Receptor Blocker (ARB), α- blocker, α- and β-blocker. If inadequate, continue to third line treatment increase drug dose or Substitute another drug or add a second drug from another class. If inadequate may need to do further studies serious organ damage may be present.