how to consider latitude and longitude of a location from googleapis

I am using "http://maps.googleapis.com/maps/api/geocode/xml?address="+address+"&sensor=true" to get the latitude and longitude of a location. From this I am getting response like below:

<?xml version="1.0" encoding="UTF-8"?>
<GeocodeResponse>
 <status>OK</status>
 <result>
  <type>locality</type>
  <type>political</type>
  <formatted_address>Chicago, IL, USA</formatted_address>
  <address_component>
   <long_name>Chicago</long_name>
   <short_name>Chicago</short_name>
   <type>locality</type>
   <type>political</type>
  </address_component>
  <address_component>
   <long_name>Cook</long_name>
   <short_name>Cook</short_name>
   <type>administrative_area_level_2</type>
   <type>political</type>
 开发者_JAVA技巧 </address_component>
  <address_component>
   <long_name>Illinois</long_name>
   <short_name>IL</short_name>
   <type>administrative_area_level_1</type>
   <type>political</type>
  </address_component>
  <address_component>
   <long_name>United States</long_name>
   <short_name>US</short_name>
   <type>country</type>
   <type>political</type>
  </address_component>
  <geometry>
   <location>
    <lat>41.8781136</lat>
    <lng>-87.6297982</lng>
   </location>
   <location_type>APPROXIMATE</location_type>
   <viewport>
    <southwest>
     <lat>41.7450495</lat>
     <lng>-87.8859170</lng>
    </southwest>
    <northeast>
     <lat>42.0109012</lat>
     <lng>-87.3736794</lng>
    </northeast>
   </viewport>
   <bounds>
    <southwest>
     <lat>41.6443350</lat>
     <lng>-87.9402669</lng>
    </southwest>
    <northeast>
     <lat>42.0231310</lat>
     <lng>-87.5236609</lng>
    </northeast>
   </bounds>
  </geometry>
 </result>
</GeocodeResponse>

The response have so many lng and lat values for a location. So Which one I have to consider?

Take the lat, lng under the location tag -- this location is approximate as indicated by location_type