Is it the application developed in Angular. Could you please try this.
1. Identify the drop arrow element of list box and click that
2. Then click on the item you want to select
A sample code in Python
#Browser
page=Sys.Browser().Page("*")
#Drop down panel property definition
setInstCodePropArray = ["ObjectType", "firstElementChild.id"]
setInstCodeValuesArray = ["Panel", "SelectVpdiCmp"]
#Click on the drop down
panel=page.FindChild(setInstCodePropArray , setInstCodeValuesArray , 20)
panel.focus
panel.Click()
# Select the item
PropArray = ["ObjectType", "contentText"]
ValuesArray = ["TextNode", "Health Sciences Center (HSC)"]
panel.FindChild(PropArray, ValuesArray,2).Click()