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: Medicine
Which of the following correlates well to overcoming of limiting amino acids in diet: March 2013 
Select and explain. 
A. Rancidity, B. Teiary structure of, C. Biological value, D. Complementary action of proteins
D: Complementary action of proteins
Answer: D: Complementary action of proteins 
Explanation: Ans. D i.e. Complementary action of proteins A varied diet that includes different types of food will contain all the amino acids that an individual needs. If a food lacking in an amino acid is eaten with another food which contains it, then the second food compensates for the first and vice versa. This is called the complementary action of proteins