#include <bits/stdc++.h>

using namespace std;

template< typename Monoid = int, typename OperatorMonoid = Monoid >
struct LinkCutTree {
  using F = function< Monoid(Monoid, Monoid) >;
  using G = function< Monoid(Monoid, OperatorMonoid, int) >;
  using H = function< OperatorMonoid(OperatorMonoid, OperatorMonoid) >;

  struct Node {
    Node *l, *r, *p;
    int idx;
    Monoid key, sum;
    bool rev;
    int sz;

    bool is_root() {
      return !p || (p->l != this && p->r != this);
    }

    Node(int idx, const Monoid &key) :
        idx(idx), key(key), sum(key), sz(1),
        l(nullptr), r(nullptr), p(nullptr), rev(false) {}
  };

  const Monoid M1;
  const OperatorMonoid OM0;
  const F f;
  const G g;
  const H h;

  LinkCutTree() : LinkCutTree(F(), Monoid()) {}

  LinkCutTree(const F &f, const Monoid &M1) :
      LinkCutTree(f, G(), H(), M1, OperatorMonoid()) {}

  LinkCutTree(const F &f, const G &g, const H &h,
              const Monoid &M1, const OperatorMonoid &OM0) :
      f(f), g(g), h(h), M1(M1), OM0(OM0) {}

  Node *make_node(int idx, const Monoid &v = Monoid()) {
    return new Node(idx, v);
  }

  void push(Node *t) {
    if(t->rev) {
      swap(t->l, t->r);
      if(t->l) t->l->rev ^= true;
      if(t->r) t->r->rev ^= true;
    }
  }

  void update(Node *t) {
    t->sz = 1;
    t->sum = t->key;
    if(t->l) t->sz += t->l->sz, t->sum = t->l->sum + t->sum;
    if(t->r) t->sz += t->r->sz, t->sum = t->sum + t->r->sum;
  }

  void rotr(Node *t) { // 右回転
    auto *x = t->p, *y = x->p;
    if((x->l = t->r)) t->r->p = x;
    t->r = x, x->p = t;
    update(x), update(t);
    if((t->p = y)) {
      if(y->l == x) y->l = t;
      if(y->r == x) y->r = t;
      update(y);
    }
  }

  void rotl(Node *t) { // 左回転
    auto *x = t->p, *y = x->p;
    if((x->r = t->l)) t->l->p = x;
    t->l = x, x->p = t;
    update(x), update(t);
    if((t->p = y)) {
      if(y->l == x) y->l = t;
      if(y->r == x) y->r = t;
      update(y);
    }
  }

  void splay(Node *t) {
    push(t);
    while(!t->is_root()) {
      auto *q = t->p;
      if(q->is_root()) {
        push(q), push(t);
        if(q->l == t) rotr(t);
        else rotl(t);
      } else {
        auto *r = q->p;
        push(r), push(q), push(t);
        if(r->l == q) {
          if(q->l == t) rotr(q), rotr(t);
          else rotl(t), rotr(t);
        } else {
          if(q->r == t) rotl(q), rotl(t);
          else rotr(t), rotl(t);
        }
      }
    }
  }

  Node *expose(Node *t) {
    Node *rp = nullptr;
    for(Node *cur = t; cur; cur = cur->p) {
      splay(cur);
      cur->r = rp;
      update(cur);
      rp = cur;
    }
    splay(t);
    return rp;
  }

  void link(Node *child, Node *parent) {
    expose(child);
    expose(parent);
    child->p = parent;
    parent->r = child;
  }

  void cut(Node *child) {
    expose(child);
    auto *parent = child->l;
    child->l = nullptr;
    parent->p = nullptr;
  }

  void evert(Node *t) {
    expose(t);
    t->rev ^= true;
    push(t);
  }

  Node *lca(Node *u, Node *v) {
    expose(u);
    return expose(v);
  }
};


int main() {
  int N;
  scanf("%d", &N);
  LinkCutTree<> lctree;
  vector< LinkCutTree<>::Node * > uku(N);
  for(int i = 0; i < N; i++) {
    uku[i] = lctree.make_node(i);
  }
  for(int i = 0; i < N; i++) {
    int K;
    scanf("%d", &K);
    while(K--) {
      int T;
      scanf("%d", &T);
      lctree.link(uku[T], uku[i]);
    }
  }
  int Q;
  scanf("%d", &Q);
  while(Q--) {
    int U, V;
    scanf("%d %d", &U, &V);
    printf("%d\n", lctree.lca(uku[V], uku[U])->idx);
  }
}


Measured memory_bytes: 9948