{
  "title": "Questions Set 1", 
  "properties": {  
    "capital_of_france": {
      "title": "What is the capital of France?",
      "type": "string",
      "oneOf": [
        {
          "const": "Berlin",
          "title": "Berlin"
        },
        {
          "const": "Paris",
          "title": "Paris"
        },
        {
          "const": "Rome",
          "title": "Rome"
        },
        {
          "const": "London",
          "title": "London"
        }
      ]
    },
     "longest_river": {
      "title": "Which river is the longest in the world?",
      "type": "string",
      "oneOf": [
        {
          "const": "Nile",
          "title": "Nile"
        },
        {
          "const": "Amazon",
          "title": "Amazon"
        },
        {
          "const": "Mississippi",
          "title": "Mississippi"
        } 
      ]
    
    },
     "tallest_mountain": {
      "title": "What is the tallest mountain in the world?",
      "type": "string",
      "oneOf": [
        {
          "const": "Kilimanjaro",
          "title": "Kilimanjaro"
        },
        {
          "const": "Mount Everest",
          "title": "Mount Everest"
        } 
      ]
    },
     "largest_dessert": {
      "title": "Which desert is the largest in the world?",
      "type": "string",
       "oneOf": [
        {
          "const": "Arabian",
          "title": "Arabian"
        },
        {
          "const": "Kalahari",
          "title": "Kalahari"
        },
        {
          "const": "Gobi",
          "title": "Gobi"
        },
        {
          "const": "Sahara",
          "title": "Sahara"
        }
      ]
    }
  },
   "required": [
      "capital_of_france",
      "longest_river",
      "tallest_mountain"
    ]
}