Egg is ideal protein because it has –: (A) High cholesterol, (B) High protein per 100 gm, (C) High biological efficiency and NPU, (D) No limiting amino acid
Answer is C. Egg is ideal protein because it has high biological efficiency and NPU :

NPU for egg : 100    Fish : 77    Wheat : 51
NPU for meat : 80   Rice : 65    Pulses : 45-50
NPU for milk : 75    Soyabean : 55