#include <iostream>
#include <fstream>
#include <iomanip>
#include <climits>
#include <limits>
#include <algorithm>
#include <array>
#include <vector>
#include <deque>
#include <queue>
#include <list>
#include <stack>
#include <string>
#include <functional>
#include <numeric>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <unordered_map>
#include <random>
#include <cmath>
#include <complex>

using namespace std;

typedef long long int ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef pair<int, int> P;
typedef pair<ll, ll> Pll;
typedef vector<ll> vll;
typedef vector<vector<ll>> vvll;

const int INFL = (int)1e9;
const ll INFLL = (ll)1e18;
const double INFD = numeric_limits<double>::infinity();
const double PI = 3.14159265358979323846;
#define Loop(i, n) for(int i = 0; i < (int)n; i++)
#define Loopll(i, n) for(ll i = 0; i < (ll)n; i++)
#define Loop1(i, n) for(int i = 1; i <= (int)n; i++)
#define Loopll1(i, n) for(ll i = 1; i <= (ll)n; i++)
#define Loopr(i, n) for(int i = (int)n - 1; i >= 0; i--)
#define Looprll(i, n) for(ll i = (ll)n - 1; i >= 0; i--)
#define Loopr1(i, n) for(int i = (int)n; i >= 1; i--)
#define Looprll1(i, n) for(ll i = (ll)n; i >= 1; i--)
#define Loopitr(itr, container) for(auto itr = container.begin(); itr != container.end(); itr++)
#define printv(vector) Loop(i, vector.size()) { cout << vector[i] << " "; } cout << endl;
#define printmx(matrix) Loop(i, matrix.size()) { Loop(j, matrix[i].size()) { cout << matrix[i][j] << " "; } cout << endl; }
#define rndf(d) (ll)((double)(d) + (d >= 0 ? 0.5 : -0.5))
#define floorsqrt(x) ((ll)sqrt((double)x) + ((ll)sqrt((double)x) * (ll)sqrt((double)x) <= (ll)(x) ? 0 : -1))
#define ceilsqrt(x) ((ll)sqrt((double)x) + ((ll)x <= (ll)sqrt((double)x) * (ll)sqrt((double)x) ? 0 : 1))
#define rnddiv(a, b) ((ll)(a) / (ll)(b) + ((ll)(a) % (ll)(b) * 2 >= (ll)(b) ? 1 : 0))
#define ceildiv(a, b) ((ll)(a) / (ll)(b) + ((ll)(a) % (ll)(b) == 0 ? 0 : 1))
#define bitmanip(m,val) static_cast<bitset<(int)m>>(val)

/*******************************************************/

typedef ll nodeval_t;
typedef ll edgeval_t;

struct tree_t {
	int n;           // |V|, index begins with 0
	vector<P> edges; // E
	vector<nodeval_t> vals; // value of nodes
	vector<edgeval_t> costs; // cost, distance, or weight of edges
};

class Tree {
private:
	struct node {
		int id; vi childs; int parent = -1;
		int deg = -1; // the number of edges of the path to the root
		int eid = -1; // edge id of the edge connected by its parent and itself
		int subtree_n = -1; // the number of nodes of the partial tree rooted by itself
		int visited = -1; // time stamp of visiting on DFS
		int departed = -1; // time stamp of departure on DFS
		nodeval_t val; // value of the node itself
		edgeval_t cost; // cost of the edge connected by its parent and itself
		bool operator<(const node & another) const {
			return deg != another.deg ? deg < another.deg : id < another.id;
		}
	};
	struct edgeinfo {
		int eid; int to; edgeval_t cost;
	};
	int n;
	static const nodeval_t init_val = 0;
	static const edgeval_t init_cost = 1;
	vector<vector<edgeinfo>> edges;
	vvi sparse_ancestors;
	void tree_construction() {
		leaves = {};
		queue<int> que;
		que.push(root);
		while (que.size()) {
			int a = que.front(); que.pop();
			deg_order.push_back(a);
			if (a == Tree::root) nodes[a].deg = 0;
			int leaf_flag = true;
			Loop(i, edges[a].size()) {
				int b = edges[a][i].to;
				if (nodes[b].deg != -1) {
					nodes[a].parent = b;
					nodes[a].eid = edges[a][i].eid;
					nodes[a].cost = edges[a][i].cost;
					nodes[a].deg = nodes[b].deg + 1;
				}
				else {
					leaf_flag = false;
					nodes[a].childs.push_back(b);
					que.push(b);
				}
			}
			if (leaf_flag) leaves.push_back(a);
		}
		Loopr(i, n) {
			int a = deg_order[i];
			Loop(j, nodes[a].childs.size()) {
				int b = nodes[a].childs[j];
				nodes[a].subtree_n += nodes[b].subtree_n;
			}
		}
	}
public:
	vector<node> nodes;
	vi deg_order; // node ids, sorted by deg
	vi leaves;
	int root;
	// T should be non-empty tree
	Tree(tree_t T, int root = -1) {
		n = T.n;
		nodes.resize(n);
		Loop(i, n) {
			nodes[i].id = i;
			nodes[i].val = T.vals.size() > i ? T.vals[i] : 0;
			nodes[i].cost = init_cost;
		}
		edges.resize(n);
		Loop(i, n - 1) {
			edges[T.edges[i].first].push_back({ i, T.edges[i].second, (T.costs.size() > i ? T.costs[i] : init_cost) });
			edges[T.edges[i].second].push_back({ i, T.edges[i].first, (T.costs.size() > i ? T.costs[i] : init_cost) });
		}
		// the node which has the greatest degree will automatically decided as the root
		if (root < 0) {
			int max_d = -1;
			Loop(i, n) {
				if (edges[i].size() > max_d) {
					Tree::root = i;
					max_d = edges[i].size();
				}
			}
		}
		else {
			this->root = min(root, n - 1);
		}
		tree_construction();
		return;
	}
	pair<int, vi> solve_center_of_gravity() {
		pair<int, vi> ret = { INT_MAX,{} };
		vector<node> c_nodes = nodes;
		sort(c_nodes.begin(), c_nodes.end());
		vi record(n, 1);
		Loopr(i, n) {
			int x = n - 1, max_x = INT_MIN;
			Loop(j, c_nodes[i].childs.size()) {
				int b = c_nodes[i].childs[j];
				max_x = max(max_x, record[b]);
				x -= record[b];
				record[c_nodes[i].id] += record[b];
			}
			max_x = max(max_x, x);
			if (max_x < ret.first) ret = { max_x,{ c_nodes[i].id } };
			else if (max_x == ret.first) ret.second.push_back(c_nodes[i].id);
		}
		sort(ret.second.begin(), ret.second.end());
		return ret;
	}
	vi solve_node_inclusion_cnt_in_all_path(bool enable_single_node_path) {
		vi ret(n, 0);
		Loop(i, n) {
			int a = i;
			// desendants to desendants
			Loop(j, nodes[a].childs.size()) {
				int b = nodes[a].childs[j];
				ret[i] += nodes[b].subtree_n * (nodes[a].subtree_n - nodes[b].subtree_n - 1);
			}
			ret[i] /= 2; // because of double counting
			ret[i] += (nodes[a].subtree_n - 1) * (n - nodes[a].subtree_n); // desendants to the others except for itself
			ret[i] += n - 1; // itself to the others
			if (enable_single_node_path) ret[i]++; // itself
		}
		return ret;
	}
	vi solve_edge_inclusion_cnt_in_all_path() {
		vi ret(n - 1, 0);
		Loop(i, n) {
			int eid = nodes[i].eid;
			if (eid < 0) continue;
			ret[eid] = nodes[i].subtree_n * (n - nodes[i].subtree_n); // members in the partial tree to the others
		}
		return ret;
	}
	void solve_sparse_ancestors() {
		sparse_ancestors.resize(n);
		vector<int> current_ancestors;
		stack<int> stk;
		stk.push(Tree::root);
		int time_stamp = 1;
		while (stk.size()) {
			int a = stk.top(); stk.pop();
			nodes[a].visited = time_stamp++;
			for (int i = 1; i <= current_ancestors.size(); i *= 2) {
				sparse_ancestors[a].push_back(current_ancestors[current_ancestors.size() - i]);
			}
			if (nodes[a].childs.size()) {
				Loop(i, nodes[a].childs.size()) {
					stk.push(nodes[a].childs[i]);
				}
				current_ancestors.push_back(a);
			}
			else {
				nodes[a].departed = time_stamp++;
				while (current_ancestors.size() && (stk.empty() || nodes[stk.top()].parent != current_ancestors.back())) {
					nodes[current_ancestors.back()].departed = time_stamp++;
					current_ancestors.pop_back();
				}
			}
		}
		return;
	}
	bool is_ancestor(int descendant, int ancestor) {
		return nodes[ancestor].visited < nodes[descendant].visited
			&& nodes[descendant].departed < nodes[ancestor].departed;
	}
	int get_lowest_common_ancestor(int u, int v) {
		if (u == v) return u;
		if (is_ancestor(u, v)) return v;
		if (is_ancestor(v, u)) return u;
		int a = u;
		while (!is_ancestor(v, sparse_ancestors[a][0])) {
			int b = sparse_ancestors[a][0];
			Loop1(i, sparse_ancestors[a].size() - 1) {
				if (is_ancestor(v, sparse_ancestors[a][i])) break;
				else b = sparse_ancestors[a][i - 1];
			}
			a = b;
		}
		return sparse_ancestors[a][0];
	}
};

int main() {
	tree_t T;
	cin >> T.n;
	Loop(i, T.n) {
		int m; cin >> m;
		Loop(j, m) {
			int t; cin >> t;
			T.edges.push_back({ i, t });
		}
	}
	Tree tree(T, 0);
	tree.solve_sparse_ancestors();
	int q; cin >> q;
	Loop(i, q) {
		int s, t; cin >> s >> t;
		cout << tree.get_lowest_common_ancestor(s, t) << endl;
	}
}


Measured memory_bytes: 34076