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: Biochemistry
Which amino acid is scarce in pulses? 
Select and explain. 
A. Lysine, B. Threonine, C. Methionine, D. Serine
C: Methionine
Answer: C: Methionine 
Explanation: Amino acids most deficient in proteins of a food item are 'limiting amino acids'.