#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using VI = vector<int>;
using VL = vector<ll>;
using loop = int;
template<class T> using PQ = priority_queue<T, vector<T>, greater<T>>;
#define FOR(i,a,n) for(loop (i)=(a);(i)<(n);++(i))
#define eFOR(i,a,n) for(loop (i)=(a);(i)<=(n);++(i))
#define rFOR(i,a,n) for(loop (i)=(n)-1;(i)>=(a);--(i))
#define erFOR(i,a,n) for(loop (i)=(n);(i)>=(a);--(i))
#define each(i, a) for(auto &i : a)
#define SORT(i) sort((i).begin(),(i).end())
#define rSORT(i,a) sort((i).begin(),(i).end(),(a))
#define all(i) (i).begin(),(i).end()
#define out(y,x) ((y) < 0 || h <= (y) || (x) < 0 || w <= (x))
#define line cout << "------------------------\n" 
#define ENDL(i,n) ((i) == (n) - 1 ? "\n" : " ")
//#define stop system("pause") //comment out this on AOJ.
constexpr ll INF = 1000000000;
constexpr ll LLINF = 1LL << 60;
constexpr ll mod = 1000000007;
constexpr ll MOD = 998244353;
constexpr ld eps = 1e-10;
constexpr ld pi = 3.1415926535897932;
template<class T>inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; }return false; }
template<class T>inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; }return false; }
inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); }
template<class T>inline istream& operator>>(istream& is, vector<T>& v) { for (auto& elemnt : v)is >> elemnt; return is; }
template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template<class T>inline vector<T> vec(size_t a) { return vector<T>(a); }
template<class T>inline vector<T> defvec(T def, size_t a) { return vector<T>(a, def); }
template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return vector<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); }
template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return vector<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); }

template<class T> class segtree {
    int n = 1;
    vector<T> dat;
    T def;

public:
    segtree(){}
    segtree(int _n, T _def) : def(_def) {
        while (n < _n)n *= 2;
        dat.resize(2 * n, def);
    }
    segtree(vector<T> a, T _def) : def(_def) {
        int _n = a.size();
        while (n < _n)n *= 2;
        dat.resize(2 * n, def);
        FOR(i, 0, _n)dat[i + n] = a[i];
        rFOR(i, 1, n)dat[i] = fun(dat[2 * i], dat[2 * i + 1]);
    }

    T fun(T x, T y) { return min(x, y); }

    void update(int i, T a) {
        i += n;
        chmin(dat[i], a);
        while (i > 1) {
            i /= 2;
            dat[i] = fun(dat[2 * i], dat[2 * i + 1]);
        }
    }

    T value(int l, int r) {
        l += n, r += n;

        T ret = def;
        for (; l < r; l /= 2, r /= 2) {
            if (l & 1) {
                ret = fun(ret, dat[l]);
                l++;
            }
            if (r & 1) {
                --r;
                ret = fun(ret, dat[r]);
            }
        }

        return ret;
    }

    T operator[](int k) { return dat[k + n]; }
};

class eulerlca {
    int n, root;
    VI first_visit, visit;
    vector<pair<int, int>> depth;
    vector<VI> g;
    segtree<pair<int, int>> seg;
public:
    eulerlca(vector<VI> _g, int _root) : g(_g), root(_root) {
        n = g.size();
        first_visit.resize(n, -1);
        dfs(root, -1, 0);
        seg = segtree<pair<int, int>>(depth, { INF,-1 });
    }

    void dfs(int now, int par, int dep) {
        if (first_visit[now] == -1)first_visit[now] = visit.size();
        depth.emplace_back(dep, now);
        visit.push_back(now);
        each(to, g[now]) {
            if (to == par)continue;
            dfs(to, now, dep + 1);
            depth.emplace_back(dep, now);
            visit.push_back(now);
        }
    }
    int lca(int a, int b) {
        if (first_visit[a] > first_visit[b])swap(a, b);
        return seg.value(first_visit[a], first_visit[b] + 1).second;
    }
};

int main() {
    init();

    int n; cin >> n;
    vector<VI> g(n);
    FOR(i, 0, n) {
        int k; cin >> k;
        FOR(j, 0, k) {
            int c; cin >> c;
            g[i].push_back(c);
        }
    }
    eulerlca euler(g, 0);

    int q; cin >> q;
    while (q--) {
        int a, b; cin >> a >> b;
        cout << euler.lca(a, b) << "\n";
    }
}


Measured memory_bytes: 32168