Question: Which part and supplier have the most profit?
SQL: SELECT T3.p_name, T4.s_name FROM partsupp AS T1 INNER JOIN lineitem AS T2 ON T1.ps_suppkey = T2.l_suppkey INNER JOIN part AS T3 ON T1.ps_partkey = T3.p_partkey INNER JOIN supplier AS T4 ON T1.ps_suppkey = T4.s_suppkey ORDER BY T2.l_extendedprice * (1 - T2.l_discount) - T1.ps_supplycost * T2.l_quantity DESC LIMIT 1