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. They 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 3 and 4, D. Carvedilol and metoprolol are the preferred drugs
A: They should be staed with optimum doses
Answer: A: They should be staed with optimum doses 
Explanation: Ref: good man and gilman, 11/e p1336 Clinical use of beta adrenergic receptor antagonistsin hea failure