This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
All are true about staing of Beta blocker therapy in a patient with congestive hea failure except 
Select and explain. 
A. That should be staed with optimum doses, B. They should be gradually increased over weeks, C. Special precautions should be taken in cases of NYHA class III and IV, D. Carvedilol and metoprolol are the preferred drugs
A: That should be staed with optimum doses
Answer: A: That should be staed with optimum doses 
Explanation: Ref-Goodman and Gillman 11/e p1336 Clinical use of Beta adrenergic receptor antagonist in hea failure These are now recommended for routine use in class Il or Ill symptoms in conjunction with ACE inhibitoror angiotensin-receptor antagonist, and diuretics These should be initiated at very low doses, generally less than one tenth of the final target dose NYHA Class IIIB and IV patients should be approached with a high level of caution; and in recently decompensated hea failure, beta-blockers should not be used until the patients are stabilizedfor several days to weeks.