**Question:** The best source of potassium is

A. Potatoes
B. Tomatoes
C. Bananas
D. Oranges

**Correct Answer:** C. Bananas

**Core Concept:**

Potassium is an essential electrolyte that plays a crucial role in maintaining fluid balance, regulating nerve and muscle function, and controlling blood pressure. The human body requires an adequate intake of potassium for optimal health, and several foods are rich in this mineral. Potassium-containing substances are categorized into alkali cations and are usually found in fruits and vegetables.

**Why the Correct Answer is Right:**

Bananas are among the best sources of potassium due to their high content of potassium ions. Bananas contain around 900-1000 mg of potassium per medium-sized banana (70-80 grams). This high potassium content makes them an excellent choice for ensuring adequate potassium intake.

**Why Each Wrong Option is Incorrect:**

A. Potatoes are also a good source of potassium, but their potassium content is significantly lower than bananas. A medium-sized potato (100 grams) typically contains around 400-500 mg of potassium.

B. Tomatoes are moderately rich in potassium, but they have a lower potassium content compared to bananas. A medium-sized tomato (100 grams) contains around 200-300 mg of potassium.

D. Oranges are not particularly rich in potassium, with only around 100-200 mg of potassium in a medium-sized orange (100 grams).

**Clinical Pearl:**

Incorporating a variety of potassium-rich foods into your diet is important for maintaining optimal electrolyte balance and overall health. Bananas, with their high potassium content, are a convenient and tasty option to consider for fulfilling your daily potassium requirements.