Database: olympics
Question: For Peter Kohnke, show the name of his/her region.
SQL: SELECT 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 WHERE T3.full_name = 'Peter Kohnke'