question: I want the plaid cymru for Polling organisation/client of yougov/itv wales for 4 may 2011
answer: SELECT plaid_cymru FROM table_name_77 WHERE polling_organisation_client = "yougov/itv wales" AND date_s__conducted = "4 may 2011"
context: CREATE TABLE table_name_77 (plaid_cymru VARCHAR, polling_organisation_client VARCHAR, date_s__conducted VARCHAR)