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<h3>Giới tính:</h3>
<form>

  <input type="radio" id="nam" name="gioitinh" value="nam">

  <label for="nam">Nam</label><br>

  <input type="radio" id="nu" name="gioitinh" value="nu">

  <label for="nu">Nữ</label><br>

  <input type="radio" id="khac" name="gioitinh" value="khac">

  <label for="khac">Khác</label>

</form>

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