**Core Concept**
Ringer Lactate solution is a balanced electrolyte solution used for fluid resuscitation. It contains sodium, chloride, lactate, and potassium, with potassium being a key component in maintaining intracellular and extracellular fluid balance.

**Why the Correct Answer is Right**
Ringer Lactate contains **4 mEq/L of potassium**. This concentration is derived from its formulation: 130 mEq/L Na⁺, 4 mEq/L K⁺, 110 mEq/L Cl⁻, and 28 mEq/L lactate. The potassium is primarily in the form of potassium chloride, contributing to the solution’s physiological balance. This level supports normal cardiac and neuromuscular function without causing hyperkalemia.

**Why Each Wrong Option is Incorrect**
Option A: 1 mEq/L – This is too low; Ringer Lactate contains significantly more potassium than 1 mEq/L.
Option C: 2 mEq/L – This is still below the actual concentration and does not reflect the correct electrolyte composition.
Option D: 6 mEq/L – This is higher than the actual value and would cause hyperkalemia, which is not present in Ringer Lactate.

**Clinical Pearl / High-Yield Fact**
Remember: Ringer Lactate has **4 mEq/L potassium**, unlike normal saline (which has 0 mEq/L), making it a better choice for patients at risk of hypokalemia or in cases requiring balanced electrolyte replacement.

✓ Correct Answer: B. 4 mEq/L