How I can tell in php if they answer the questions 1,2,3,5,6 with YES the let out "the answer A" if they answer the questions 1,3,5,10,12 with YES let out "the answer B" in other cases, let out "the answer C"
<form action="questions".php" method="POST">
<p>1.Question1?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<p>2.Question2?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<p>3.Question3?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<p>4.Question4?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<p>5.Question5?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<p>6.Question6?</p>
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
7.Question7?
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
8.Question8?
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
9.Questione9?
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
10.Question10?
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
11.Question11?
<p><select> <option value="YES">YES</option> <option value="NO">NO</option> </select></p>
<input name="submit" type="submit" value="submit" /> </form>
questions.php?