#include <stdio.h>
#include <stdlib.h>

int lca ( int a , int b , int * height , int * parent , int n ) {

    if ( height[a] > height[b] ) {
        int t;
        t = a;
        a = b;
        b = t;
    }

    int pa = a , pb = b;

    while ( height[pa] != height[pb] ) {
        pb = parent[pb];
    }

    if ( pa == pb )
        return pa;

    while ( parent[pa] != parent[pb] ) {
        pa = parent[pa];
        pb = parent[pb];
    }

    if ( parent[pa] == 0 )
        return pa;
    else
        return parent[pa];
}

int main( int argc , char * argv[] ) {

    int t , i , z;
    scanf("%d" , &t);

    for ( z = 1; z <= t ; z++ ) {
        printf("Case %d:\n" , z);

        int n , i , j;
        int * height;
        int * parent;
        scanf("%d" , &n);

        height = ( int * ) calloc ( n+1 , sizeof(int) );
        parent = ( int * ) calloc ( n+1 , sizeof(int) );

        for ( i = 1 ; i <= n ; i++ ) {
            int k , l;
            scanf("%d" , &k);
            while ( k-- ) {
                scanf("%d" , &l);
                height[l] = height[i]+1;
                parent[l] = i;
            }
        }

        int k;
        scanf("%d" , &k);

        while ( k-- ) {
            int a,b;
            scanf("%d%d" , &a,&b);

            printf("%d\n" , lca( a,b, height , parent , n ));

        }

        free(height);
        free(parent);

    }

    return 0;
}