Which of the following is a calcium-containing phosphate binder?

Calcium-containing phosphate binders are used to help manage phosphate levels in patients with conditions such as chronic kidney disease. Calcium acetate is the correct answer because it is a compound that contains calcium and is specifically used to bind dietary phosphate in the gastrointestinal tract. This action helps reduce the absorption of phosphate, assisting in the management of hyperphosphatemia, which is common in patients with renal impairment.

The other options listed do not contain calcium. Sodium polystyrene sulfonate is primarily used to treat hyperkalemia (high potassium levels) and does not serve as a phosphate binder. Sodium zirconium cyclosilicate, another potassium binder, is not used for phosphate control. Similarly, magnesium hydroxide is an antacid and does not function as a phosphate binder in the same way that calcium-based products do. Understanding the specific uses and components of these agents is crucial in managing electrolyte disturbances effectively.