This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Amino acid score of animal foods – 
Select and explain. 
A. 40–50, B. 50–60, C. 70–80, D. 90–100
C: 70–80
Answer: C: 70–80 
Explanation: Amino acid score (chemical score)

It is used for qualitative assessment of protein.
It is a measure of the concentration of each essential amino acid in the test protein expressed as a percentage of that amino acid in reference protein (egg protein).

Amino acid score = No. of mg of one amino acid per gm of protein / No. of mg of same amino acid per gm of egg protein x 100

The amino acid score is between 50 and 60 for starches and 70-80 for animal foods.