Step 1: Understanding the Concept:
Proteins in foods are categorized based on their biological source and solubility characteristics.
Step 2: Detailed Explanation:
Analyzing the protein sources:
1. Albumin (Ovalbumin): The major globular protein found in egg white (constituting $\approx 54\%$ of total egg white protein), known for its complete essential amino acid profile and highest Biological Value ($BV \approx 100$).
2. Casein: Major phosphoprotein of milk.
3. Zein: Prolamine storage protein of maize.
4. Gluten: Viscoelastic storage protein complex of wheat.
Step 3: Final Answer:
Therefore, Albumin is present in Egg, corresponding to option (D).