**Core Concept**
The management of chronic heart failure involves the use of medications to reduce symptoms, improve quality of life, and prolong survival. The primary goal is to decrease the heart's workload, improve cardiac output, and prevent further cardiac remodeling.

**Why the Correct Answer is Right**
The drug of choice for chronic heart failure is a beta-blocker, specifically a beta-1 selective blocker such as bisoprolol or carvedilol. Beta-blockers work by blocking the effects of epinephrine on the heart, reducing heart rate, and decreasing the force of contraction. This leads to a decrease in myocardial oxygen demand, which is beneficial in patients with heart failure. Additionally, beta-blockers have been shown to improve survival and reduce hospitalization rates in patients with heart failure.

**Why Each Wrong Option is Incorrect**
**Option A:** ACE inhibitors are also used in the management of heart failure, but they are not the first-line treatment. They work by inhibiting the conversion of angiotensin I to angiotensin II, which has a vasoconstrictive effect and increases aldosterone levels.
**Option B:** Diuretics are used to manage symptoms of heart failure, such as edema and shortness of breath, but they do not improve survival or reduce hospitalization rates.
**Option C:** Aldosterone antagonists, such as spironolactone, are used in patients with severe heart failure, but they are not the first-line treatment. They work by blocking the effects of aldosterone, which increases sodium and water retention.

**Clinical Pearl / High-Yield Fact**
Beta-blockers should be started at a low dose and gradually increased to the target dose to prevent worsening of heart failure symptoms. This is known as a "beta-blocker titration" and is an important clinical strategy.

**Correct Answer:** C.