swift4 uitableview retain selection - uitableview

Question

I am preparing a small app for online exams for which I need to reload the tableView for every question. Multiple selection and single selection both are needed based on question type. I was able to manage the selection type based on question type but the thing is when i reload the tableview the previous selection is replicating in the next question.
var DictItemSerialNumber = 0
let Dict = [["Question":"How many days in a week?",
"Options":["1","2","3","7"],
"QuestionType":1],
["Question":"How many days in a month?",
"Options":["28","29","30","31","32"],
"QuestionType":2],
["Question":"How many days in a Year?",
"Options":["234","265","365","400"],
"QuestionType":1]]
var SavedOptions = [String:[Any]]()
var selectedIndex:Int? = nil
override func viewDidLoad() {
super.viewDidLoad()
self.Tab.rowHeight = UITableView.automaticDimension
self.Tab.estimatedRowHeight = 300
self.Tab.tableFooterView = UIView()
self.Tab.delegate = self
self.Tab.dataSource = self
self.Tab.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
}
#IBAction func PrvsBtnActn(_ sender: UIButton) {
if DictItemSerialNumber > 0 {
DictItemSerialNumber -= 1
Tab.reloadData()
}
}
#IBAction func NextBtnActn(_ sender: UIButton) {
if DictItemSerialNumber < Dict.count-1{
DictItemSerialNumber += 1
Tab.reloadData()
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let DictObj = Dict[DictItemSerialNumber] as NSDictionary
let optionsCount = DictObj["Options"] as! NSArray
return optionsCount.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = Tab.dequeueReusableCell(withIdentifier: "cell")!
let DictObj = Dict[DictItemSerialNumber]
let qstnType = DictObj["QuestionType"] as! Int
if qstnType == 2{
self.Tab.allowsMultipleSelection = true
}else{
self.Tab.allowsMultipleSelection = false
}
QstnLbl.text = DictObj["Question"] as? String
let optionsAns = DictObj["Options"] as! NSArray
cell.textLabel?.text = optionsAns[indexPath.row] as? String
cell.selectionStyle = .none
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.accessoryType = .checkmark
}
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
cell.accessoryType = .none
}
}
}
question type = 1 means single selection and 2 is multiple selection