Question: What is the id and name of the enzyme with most number of medicines that can interact as 'activator'?
SQL: SELECT T1.id ,  T1.name FROM enzyme AS T1 JOIN medicine_enzyme_interaction AS T2 ON T1.id   =   T2.enzyme_id WHERE T2.interaction_type   =   'activitor' GROUP BY T1.id ORDER BY count ( * )  DESC LIMIT 1