<form id="alternativas" method="POST" >

                <ul>
                    <a href="javascript:">
                    <li>
                    <?php
                     echo ('<input type="radio" name="resp1izi" id="resp1izi_A" value="A" />' . $alt_a);
                    ?>
                    </li></a>
                    <a href="javascript:"><li>
                        <?php
                     echo ('<input type="radio" name="resp1izi" id="resp1izi-B" value="B" />' . $alt_b);

                    ?>
                    </li></a>
                    <a href="javascript:"><li>
                        <?php

                     echo ('<input type="radio" name="resp1izi" id="resp1izi-C" value="C" />' . $alt_c);

                    ?>

                        </li></a>
                    <a href="javascript:"><li>
                        <?php

                     echo ('<input type="radio" name="resp1izi" id="resp1izi-D" value="D" />' . $alt_d);

                    ?>
                        </li> </a>
                    <a href="javascript:"><li>
                        <?php
                     echo ('<input type="radio" name="resp1izi" id="resp1izi-E" value="E" />' . $alt_e);
                        ?>
                    </li></a>
                    <li><input type="submit" value="Validar resposta"> </li>

                    </ul>

                    </form>