Which of the following statements regarding TCA cycle intermediates serving as precursors to amino acids is/are true?
I. Malate is directly used to synthesize the amino acid aspartate.
II. Succinate is a precursor for the synthesis of glutamine.
III. Oxaloacetate is used to synthesize serine.
IV. α-Ketoglutarate is a precursor for the synthesis of glutamate.

• A. III only
• B. IV only
• C. III and IV
• D. II, III and IV

Answer: (B)