diff --git a/class/Tasks/OpenEndedTask.php b/class/Tasks/OpenEndedTask.php
index 9276f80..5299fb2 100644
--- a/class/Tasks/OpenEndedTask.php
+++ b/class/Tasks/OpenEndedTask.php
@@ -17,6 +17,10 @@ class OpenEndedTask extends PicturedTask
         $this->correct_answer[] = $ca;
     }
 
+    public function clearCorrectAnswers(): void {
+        $this->correct_answer = [];
+    }
+
     public function saveAnswer(mixed $ans): bool
     {
         // collect transformations