Retrieve selected Select Option value

I tried to retrieve the selected unit_selector data for the key, value in for loop in the value_row class. but it didn't work. It just didn't display anything.

{% if forloop.first %}
                <tr class="title_row">
                    {% for k,v,i,z,b in sorted_title_list %}
                        {% if k == selected_item %}
                            {% if b|length == 1 %}
                            {% else %}
                                <th><label for="**unit_selector**">
                                    <select class="master_select" id="**unit_selector**" name="unit_selector">
                                        {% for key, value in b.items %}
                                            <option value="{{ value }}" id="{{ key }}">{{ value }}</option>
                                        {% endfor %}
                                    </select>
                                </label></th>
                            {% endif %}
                        {% endif %}
                    {% endfor %}
                </tr>
            {% endif %}
            <tr class="**value_row **{% if epoch_form.errors %}error{% endif %}">
                {% for k,v,i,z,b in sorted_title_list %}
                    {% if k == selected_item %}
                        {% if b|length == 1 %}
                        {% else %}
                            {% for key, value in b.items %}
                                {% if unit_selector.key == key %}
                                    <td class="_unit" id="{{ key }}">{{ value }}</td>
                                {% endif %}
                            {% endfor %}
                        {% endif %}
                    {% endif %}
                {% endfor %}
            </tr>

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