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
Conditionally Essential amino acids are: 
Select and explain. 
A. Leucine & Lysine, B. Histidine & Arginine, C. Tyrosine & Cysteine, D. Phenylalanine & Tryptophan
C: Tyrosine & Cysteine
Answer: C: Tyrosine & Cysteine 
Explanation: Conditionally Essential Amino Acids (CEAA): Non-essential amino acids may turn essential if their precursors are limited in the body. - Among given options Tyrosine (derived from Phenylalanine) and Cysteine (derived from methionine) are CEAA. - Other CEAA include Arginine Glutamine Taurine & Glycine.