#include<bits/stdc++.h>
using namespace std;
int dp[1001][10];
int level[1001];
void dynamic(int,int,int,vector<int>*);
int lca(int,int,int);
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int tc,n,m,q,v,w,i,j,k,temp;
    cin>>tc;
    for(i=0;i<tc;i++){
        cin>>n;
        vector<int> vec[n+1];
        for(j=1;j<=n;j++){
            cin>>m;
            for(k=0;k<m;k++){
                cin>>temp;
                vec[j].push_back(temp);
                vec[temp].push_back(j);
            }
        }
        int log=ceil(log2(n));
        level[1]=0;
        dynamic(log,1,1,vec);
        cin>>q;
        cout<<"Case "<<i+1<<":"<<endl;
        for(j=0;j<q;j++){
            cin>>v>>w;
            cout<<lca(v,w,log)<<endl;
        }
    }
}
void dynamic(int log,int u,int parent,vector<int>*vec)
{
    dp[u][0]=parent;
    for(int i=1;i<=log;i++)
        dp[u][i]=dp[dp[u][i-1]][i-1];
 
    vector<int>::iterator it;
    for(it=vec[u].begin();it!=vec[u].end();it++){
        if(*it!=parent){
            level[*it]=level[u]+1;
            dynamic(log,*it,u,vec);
        }
    }
}
int lca(int u,int v,int log)
{
    if(level[u]<level[v])
        swap(u,v);
    for(int i=log; i>=0; i--)
        if(level[u]-pow(2,i)>=level[v])
            u=dp[u][i];
    if(u==v)
        return u;
    for(int i=log;i>=0;i--){
        if(dp[u][i]!=dp[v][i]){
            u=dp[u][i];
            v=dp[v][i];
        }
    }
    return dp[u][0];
}
 

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