## **Core Concept**
The resistance of an organ to electric current primarily depends on its water content and the presence of electrolytes. Organs with lower water content and fewer electrolytes tend to be more resistant to electric current.

## **Why the Correct Answer is Right**
The skin is known for being the most resistant organ to electric current. This is because the skin has a relatively low water content compared to other organs and a high concentration of dead cells in its outer layer, the stratum corneum. These factors contribute to its high electrical resistance. When considering the passage of electric current through the body, the skin's resistance is a critical factor, especially when electrodes are applied to the skin surface.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because, although muscles have varying levels of resistance, they generally contain more water and electrolytes than the skin, making them less resistant to electric current.
- **Option B:** This option is incorrect as it likely refers to another organ or tissue, but without specification, it's understood that organs like the brain, which has high water content, would be less resistant.
- **Option D:** This option is incorrect because bones, while having some degree of resistance, are not as resistant as the skin due to their lower water content but higher mineral content. However, compact bone is more resistive than the skin.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the skin's resistance can significantly decrease when it's moist or damaged, which is why electrical safety precautions emphasize avoiding contact with electrical sources when skin is wet. This fact is crucial for preventing electrical injuries.

## **Correct Answer:** . Skin