diff --git a/vlmeval/dataset/utils/multiple_choice.py b/vlmeval/dataset/utils/multiple_choice.py
index e33c40940..67212094e 100644
--- a/vlmeval/dataset/utils/multiple_choice.py
+++ b/vlmeval/dataset/utils/multiple_choice.py
@@ -591,9 +591,9 @@ def extract_characters_regex(s, choices=['(A)', '(B)', '(C)', '(D)', '(E)']):
         'The correct answer is',
         'The answer is',
         'The answer',
-        'The best option is'
+        'The best option is',
         'The correct option is',
-        'Best answer:'
+        'Best answer:',
         'Best option:',
     ]
     for answer_prefix in answer_prefixes: