Which physician was trained in the procedure that costs the most.
SELECT T1.name FROM physician AS T1 JOIN trained_in AS T2 ON T1.employeeid  =  T2.physician JOIN procedures AS T3 ON T3.code  =  T2.treatment ORDER BY T3.cost DESC LIMIT 1
SELECT T1.name FROM physician AS T1 JOIN trained_in AS T2 ON T1.employeeid  =  T2.physician JOIN procedures AS T3 ON T3.code  =  T2.treatment ORDER BY T3.cost DESC LIMIT 1
[{'Name': 'John Wen'}]