What is the id and name of the enzyme that can interact with the most medicines as an activator?
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
enzyme that can interact with most medicines as an activator refers to MAX(COUNT(T2.medicine_id)) where interaction_type = 'activitor'; enzyme id and name refers to T1.id, T1.name;