Task: Question Answering
Input (English): Question: In humans, the synthesis of aspartate from oxaloacetate is catalysed by: 
 Options:  <1> Oxalacetate decarboxylase. <2> Aspartate synthetase. <3> Aspartate dehydrogenase. <4> Pyridoxal phosphate-dependent transaminase. <5> Oxalacetate ligase.
Output (English): 4