Add Select Values from within the Custom Fields Group

Hello there,

I have a custom post type and creating custom fields as shown in the screenshot.
Which are
1. Group field type group "Quiz Base Group" and it has sub-fields as:
a) Question field type wysiwyg editor
b) Answer 1 field type wysiwyg editor
c) Answer 2 field type wysiwyg editor
d) Answer 3 field type wysiwyg editor
e) Answer 4 field type wysiwyg editor
f) Answer Explanation field type wysiwyg editor
g) Select Correct Answer field type Select

Now I want to output the values of Answer 1 to Answer 5 in the Select Correct Answer options which is Select type.

How can I achieve this? Let me know if you need further info.