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
Rice is deficient in which amino acid ? 
Select and explain. 
A. Serine, B. Threonine, C. Methonine, D. Cystone
B: Threonine
Answer: B: Threonine 
Explanation: Ans. is 'B' i.e., Threonine Cereals (wheat & rice) are deficient in lysine threonine. But in comparison to other cereals protein (e.g wheat) rice protein contains more lysine (though in lesser amounts) - thus rice proteins is considered to be better quality among cereals.