CREATE TABLE table_76647 ("Target/Approach" TEXT, "Candidate Name" TEXT, "Trial Phase" TEXT, "Trial Start Date" TEXT, "Expected End Date" TEXT)

What is Trial Start Date, when Candidate Name is PBT2?
SELECT "Trial Start Date" FROM table_76647 WHERE "Candidate Name" = 'pbt2'
SELECT "Trial Start Date" FROM "table_76647" WHERE "Candidate Name" = 'pbt2'