**Core Concept**
Spironolactone, a potassium-sparing diuretic, works by antagonizing the effects of aldosterone at the mineralocorticoid receptor. This leads to increased sodium excretion, water retention, and potassium retention. The key concern when combining spironolactone with other medications is the potential for hyperkalemia due to additive potassium retention.

**Why the Correct Answer is Right**
The combination of spironolactone with an ACE inhibitor or an angiotensin II receptor blocker (ARB) is particularly concerning because both classes of medications also lead to increased potassium levels by reducing aldosterone-mediated potassium excretion. This synergistic effect can result in severe hyperkalemia, potentially leading to cardiac arrest. The mechanism involves the blockade of the renin-angiotensin-aldosterone system (RAAS), which normally regulates electrolyte balance and blood pressure.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we'll proceed with the others.
* **Option B:** This option is not provided, so we'll proceed with the others.
* **Option C:** There is no direct interaction between spironolactone and beta-blockers that would lead to a significant risk of hyperkalemia.
* **Option D:** This option is not provided, so we'll proceed with the others.

**Clinical Pearl / High-Yield Fact**
When combining spironolactone with an ACE inhibitor or ARB, closely monitor potassium levels and consider adjusting the dose or adding a potassium-wasting diuretic to mitigate the risk of hyperkalemia.

**Correct Answer:** C. Beta-blockers