Step 1: Understanding the Concept:
The avian egg is a biological masterpiece designed to support the complete development of an embryo outside the mother's body.
Consequently, it must contain all the essential nutrients—proteins, fats, vitamins, and minerals—required for building a living chick.
However, the nutritional profile of an egg is slightly different from the requirements of the adult human diet, and one particular vitamin is naturally absent.
Step 2: Detailed Explanation:
Let's review the vitamin content of a standard poultry egg:
1. Fat-Soluble Vitamins: The yolk is extremely rich in Vitamins A, D, E, and K. Eggs are one of the few natural food sources of Vitamin D. Vitamin A is responsible for the health of the embryo's eyes and skin.
2. B-Complex Vitamins (A): Eggs are a powerhouse of B vitamins, including B12 (Cobalamin), B2 (Riboflavin), B5 (Pantothenic acid), and Biotin. These are essential for energy metabolism.
3. Vitamin C (B): Also known as Ascorbic acid. Poultry eggs contain virtually no Vitamin C.
Why is this the case? Most birds (including chickens) have the ability to synthesize their own Vitamin C in their kidneys or liver. Unlike humans, they do not need to obtain it from their diet. Therefore, the hen does not deposit Vitamin C into the egg. Furthermore, Vitamin C is primarily found in plant-based sources like citrus fruits and green vegetables.
4. Vitamin A (C): As mentioned, it is present in high amounts in the yolk.
5. Vitamin D (D): It is naturally present in eggs, helping in calcium absorption for the chick's skeletal development.
Conclusion: While eggs provide a nearly complete vitamin supplement, they lack Vitamin C.
Step 3: Final Answer:
Among the options provided, Vitamin C is the only one not found in poultry eggs.
Hence, the correct option is (B).