This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins, Fats, Rich Sources, Subject name: Social & Preventive Medicine
Limiting amino acids in wheat are: 
Select and explain. 
A. Methionine and lysine, B. Lysine and threonine, C. Threonine and methionine, D. Arginine and lysine
B: Lysine and threonine
Answer: B: Lysine and threonine 
Explanation: Amino acids most deficient in proteins of a food item are 'Limiting amino acids'. Food Item Limiting Amino Acid(s) Cereals Threonine (& Lysine) Pulses Methionine (& Cysteine) Maize Tryptophan (& Lysine) - As wheat is a cereal, limiting AA are Lysine & threonine.