<option value="">Select a category</option>
<optgroup label="Fruits">
<option value="apple">Apple</option>
<option value="orange">Orange</option>
<option value="banana">Banana</option>
</optgroup>
<optgroup label="Vegetables">
<option value="carrot">Carrot</option>
<option value="broccoli">Broccoli</option>
<option value="spinach">Spinach</option>
</optgroup>
<optgroup label="Grains">
<option value="wheat">Wheat</option>
<option value="rice">Rice</option>
<option value="corn">Corn</option>
</optgroup>
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