What would be your approach to having random categories and each category having more elements?

@SwathedOrange I think I understand what you want. Here is what I would do

Create a new class of Question

 public class Question
 {
     public string description;
     public int type;
 }

I would create a list of that Question class

 public List<Question> questions = new List<Question>();

Populate that list however you want, personally I would use a CSV in resources so I could edit the CSV and the questions would be updated.

To select a random question I would write a function to return a random question based on the type needed. Using Linq to get a question (Note you'll need using System.Linq;)

 public Question GetQuestion(int type)
 {
     List<Question> tempList = (from x in questions where x.type == type select x).ToList();
     return tempList[Random.Range(0, tempList.Count)];
 }

There are a number of benefits to using this, it moves the questions into a external file for easier management, it allows you to add new fields to a question without a clunky string. It also allows for language translation in the external file if you wanted to take the game to other countries.

As an example for expansion I added the ASKED flag.

 public class Question
 {
     public string description;
     public int type;
     public bool asked = false;
 }

Using the new asked bool you can return questions that haven't yet been asked

 List<Question> tempList = (from x in questions where x.type == type && !x.asked select x).ToList();

Its worth noting that that could lead to a list without a selection question due to all questions could have been asked, so you will have to make sure you handle that situation

Something like this, when all questions have been asked I reset all questions of that type

 public Question GetQuestion(int type)
     {
         List<Question> tempList = (from x in questions where x.type == type &&!x.asked select x).ToList();
 
         if(tempList.Count == 0)
         {
             ResetAllQuestions(type);
             tempList = (from x in questions where x.type == type && !x.asked select x).ToList();
         }
 
         Question selectedQuestion = tempList[Random.Range(0, tempList.Count)];
         selectedQuestion.asked = true;
 
         return selectedQuestion;
     }
 
     public void ResetAllQuestions(int type)
     {
         foreach (var question in (from x in questions where x.type== type select x).ToList())
         {
             question.asked = false;
         }
     }

Hope that helps? I haven't tested any of this but should work Thanks Mike