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: Biochemistry
Of the following groups of amino acids produce common component of the TCA cycle is: 
Select and explain. 
A. Alaine, isoleucine, leucine, lysine, B. Serine, asparagines, glycine, glutamate, C. Isoleucine, valine, methionine, D. Prolone, leucine, tryptophan
C: Isoleucine, valine, methionine
Answer: C: Isoleucine, valine, methionine 
Explanation: C i.e. Isoleucine, Valine, methionine Valine, Isoleucine and MethionineQ produce succinyl COA which is an impoant component of TCA cycle.