This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Dietary essential amino acid- 
Select and explain. 
A. Cysteine, B. Arginine, C. Methionine, D. Selenocysteine
C: Methionine
Answer: C: Methionine 
Explanation: Ans. is 'c' i.e., MethionineNutritionally EssentialNutritionally NonessentialArginineAlanineHistidineAsparagineIsoleucineAsparatateLeucineCysteineLysineGlutamateMethionineGlutaminePhenylalanineGlycineThreonineProlineTryptophanSerineValineTyrosine