Here is the completely updated `question.php`. I added the missing `$breadcrumbs` array and defined `$category_name` and `$topic_name` right before the header is included. This ensures that `header.php` generates the correct Breadcrumb Schema, page title, and meta description for single question pages. Replace your entire `question.php` with this: ```php Basic Algebra Questions
TestMaster MCQs

Basic Algebra Questions

Home Mathematics Basic Algebra
Q. If 2x + 5 = 15, what is the value of x?
2
5
7
10

Explanation:

2x = 10, so x = 5.

Q. If 3x - 7 = 14, what is the value of x?
4
12
10
7

Explanation:

3x = 21, so x = 7.

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