Getting specific field

public void GetData()
{
string urli = inputUrl.Text.ToString();
string baseAddress = urli;
var response = client.GetAsync(baseAddress + "test/Test").Result;

        data.Text = response.Content.ReadAsStringAsync().Result;
    }

i currently using this as my get method to get all of the data from my web api.

But what i want is to get a specific data in that web api? Like "studentname" only and i will display it on a textview.

Thanks in advance