system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
On consumption of which aminoacid, requirement of methionine is reduced because of sparing effect?
assistant
The correct answer is  Ans. is 'b' i.e., Cysteine"Adequate dietary source of cysteine 'spares' methionine".* Methionine is an essential amino acid.* Methionine is required for synthesis of cysteine (thus cysteine is non-essential amino acid)* Thus, cysteine can spare the requirment of methionine in diet.