Update app.py

app.py

@@ -302,7 +302,7 @@ class AnswerValidator:
     """Validate and check answers"""
     
     @staticmethod
-    def load_answer_sheet(filepath: str = "answer_sheet.json") -> Dict[str, str]:
+    def load_answer_sheet(filepath: str = "answer_sheet_json.json") -> Dict[str, str]:
         """Load answer sheet"""
         try:
             if os.path.exists(filepath):