## **Core Concept**
The question tests knowledge of the nutritional value of eggs, specifically their energy content in kilocalories (kcal). Eggs are a common food item and a good source of protein and various vitamins and minerals.

## **Why the Correct Answer is Right**
One large egg typically weighs about 50-60 grams and provides approximately 70 kcal of energy. The energy content comes from its macronutrients: proteins (about 6 grams), fats (about 5 grams), and carbohydrates (negligible). The general estimation for energy content is roughly 70 kcal per large egg.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option suggests a much lower caloric content than what is known for an egg, which is not accurate.
- **Option B:** This is also lower than the known caloric content of an average egg.
- **Option D:** This suggests a significantly higher caloric content than what is typically found in an egg.

## **Clinical Pearl / High-Yield Fact**
A useful fact to remember is that eggs are considered a complete protein source, meaning they contain all nine essential amino acids that the human body cannot synthesize on its own. They are also a good source of vitamin D, B12, and choline.

## **Correct Answer Line**
**Correct Answer: C. 70.**