What is the NOC code of the region where the tallest male Olympic competitor is from?
NOC code of the region refers to noc; male refers to gender = 'M'; the tallest refers to MAX(height);
SELECT T1.noc 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 WHERE T3.gender = 'M' ORDER BY T3.height DESC LIMIT 1