Task: Text Categorization
Input (English): Question: The hepatic synthesis of methionine from homocysteine ​​requires: 
 Options:  <0> Methylmalonyl-CoA mutase. <1> Methylcobalamin. <2> 5'-Adenosilcobalamin. <3> Coenzyme B6. <4> Methionine adenosyl transferase.
Output (English): chemistry