XML Deserialization Rules

I need to deserialize xml file and its structured this way:

<NPCs>
   <LabAssistant1>
      <Questions>
         <Question>
            <Type>CheckBox</Type>
            <Points>10</Points>
            <Text>Q1</Text>
            <Answers>
               <Answer>
                  <Correct>False</Correct>
                  <Text>A1</Text>
               </Answer> 
               <Answer>
                  <Correct>True</Correct>
                  <Text>A2</Text>
               </Answer> 
               <Answer>
                  <Correct>False</Correct>
                  <Text>A3</Text>
               </Answer> 
            </Answers>
         </Question>
      </Questions>
   </LabAssistant1>

   <LabAssistant2>
      <Questions>
          ...
      </Questions>
   </LabAssistant2>
</NPCs>

So as you can see am having root node NPCs and my goal is to read questions separately by LabAssistant1 name or any tag name in NPCs.

String questionsPath = path+"/questions.xml";
XmlReader reader=XmlReader.Create(new StreamReader(questionsPath));

XmlRootAttribute xmlRoot = new XmlRootAttribute();
xmlRoot.ElementName = npc;

reader.ReadToDescendant(npc);
XmlSerializer se = new XmlSerializer(typeof(Question[]),xmlRoot);

Question[] qs=se.Deserialize(reader) as Question[];
    Console.WriteLine(qs.Length.ToString()); // Always 0

Here are the classes Question and Answer:

public class Question
{

    public String Text { get;  set; }
    public Answer[] Answers { get;  set; }
    public QuestionType Type { get;  set; }
    private int points;
    public Question()
    {

    }
    public Question(String text, Answer[] answers, QuestionType type,int points)
    {
        this.Text = text;
        this.Answers = answers;
        this.Type = type;
        this.points = points;
    }
}

public class Answer
{
    public String Text { get; set; }
    public bool Correct { get; set; }
    public Answer()
    {

    }
    public Answer(String text, bool correct)
    {
        this.Text = text;
        this.Correct = correct;
    }
}

My question here is, do i need to attach attributes on my class members?