i am new at ror.

option select tag in rails

```
<%= select_tag(:city_id, '<option value="1">Lisbon</option>,<option value="2">Madrid</option>' %>

```

produces this html:

```
<select id="city_id" name="city_id">
    <option value="1">Lisbon</option>
<option value="2">hjkLisbon</option>
</select>

```

and option select tag 

```
<%= select_tag(:city_id, options_for_select([['Lisbon', 1], ['Madrid', 2]])) %>

```

produces this html:

```
<select id="city_id" name="city_id">
<option value="1">Lisbon</option>
<option value="2">Madrid</option>
</select>

```

for second option select tag i am getting the dropdown with options but in first one i am not getting it, only dropdown is there in first one but no options.
can anybody please explain me why it is so?