Give the NOC code and region name of the heaviest competitor.
NOC code refers to noc; the heaviest refers to MAX(weight);
SELECT T1.noc, T1.region_name FROM noc_region AS T1 INNER JOIN person_region AS T2 ON T1.id = T2.region_id INNER JOIN person AS T3 ON T2.person_id = T3.id ORDER BY T3.weight DESC LIMIT 1