How to escape comma (,) in System.List component

Summary

Escaping comma (,) in System.List component

Content

Hi,

I'm trying to add a comma (,) in the list of options to order a pizza in a pizza skill as below

component: "System.List"
    properties:
      #options: "Thick,Thin,Stuffed,Pan"
      options: "1. Large, hot pizza, 2.Large, with extra cheeze, 3. Medium, 4. Small"
      prompt: "What crust do you want for your Pizza?"
      variable: "crust"
    transitions: {}

When I test this skill, its printing 6 options instead of 3. 

 

any ideas how can I fix this ?

Thanks

Code Snippet

metadata:
  platformVersion: "1.0"
main: true
name: "PizzaBot"
parameters:
  age: 18
context:
  variables:
    size: "PizzaSize"
    type: "PizzaType"
    crust: "PizzaCrust"
    iResult: "nlpresult"
states:
  intent:
    component: "System.Intent"
    properties:
      variable: "iResult"
    transitions:
      actions:
        OrderPizza: "resolvesize"
        CancelPizza: "cancelorder"
        unresolvedIntent: "unresolved"
  resolvesize:
    component: "System.SetVariable"
    properties: