Find the node with maximum elements

Hello,
I have a requirement to write a xsl transformation to find the node which has the maximum number of elements

Below is a sample xml file 

<Sample>
    <Toyota>
          <Car>Camry</Car>
          <Car>Corrola</Car>
     </Toyota>
     <Honda>
            <Car>Accord></Car>
          <Car>Civic</Car>
          <Car>Pilot</Car>
     </Honda>
     <Mitsubishi>
        <Car>Lancer</Car>
        <Car>Lancer</Car>
        <Car>Lancer</Car>
     </Mitsubishi>
    <Hyundai>
        <Car>Sonata</Car>
        <Car>Accent</Car>
</Hyundai>
</Sample>

The xsl should return Honda and Mitsubishi

Would appreciate your help.

Thanks
Avaneesh