#include <bits/stdc++.h>
using namespace std;
const int MAX = 100005;
const int LG = 17;
vector<int> adj[MAX];
struct node {
  int a[11];
  node() { memset(a, 63, sizeof(a)); }
  void insert(int val) {
    a[10] = val;
    sort(a, a + 11);
  }
} vals[LG][MAX];
node merge(node x, node y) {
  node ans = x;
  for (int i = 0; i < 11; i++) ans.insert(y.a[i]);
  return ans;
}
int par[LG][MAX], d[MAX];
void dfs(int p, int v) {
  par[0][v] = p;
  for (int i = 1; i < LG; i++) {
    par[i][v] = par[i - 1][par[i - 1][v]];
    vals[i][v] = merge(vals[i - 1][v], vals[i - 1][par[i - 1][v]]);
  }
  for (int i = 0; i < (int)adj[v].size(); i++) {
    int u = adj[v][i];
    if (u != p) {
      d[u] = d[v] + 1;
      dfs(v, u);
    }
  }
}
int get_parent(int v, int k) {
  for (int i = 0; i < LG; i++)
    if ((1 << i) & k) v = par[i][v];
  return v;
}
int lca(int u, int v) {
  if (d[u] < d[v]) swap(u, v);
  u = get_parent(u, d[u] - d[v]);
  if (u == v) return u;
  for (int i = LG - 1; i >= 0; i--)
    if (par[i][u] != par[i][v]) {
      u = par[i][u];
      v = par[i][v];
    }
  return par[0][v];
}
node get(int v, int k) {
  node ans;
  for (int i = 0; i < LG; i++)
    if ((1 << i) & k) {
      ans = merge(ans, vals[i][v]);
      v = par[i][v];
    }
  return ans;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m, q;
  cin >> n >> m >> q;
  for (int i = 0; i < n - 1; i++) {
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  for (int i = 0; i < m; i++) {
    int c;
    cin >> c;
    c--;
    vals[0][c].insert(i);
  }
  dfs(0, 0);
  while (q--) {
    int u, v, k;
    cin >> u >> v >> k;
    u--;
    v--;
    int p = lca(u, v);
    node x = get(u, d[u] - d[p]);
    node y = get(v, d[v] - d[p] + 1);
    node ans = merge(x, y);
    int tmp = 0;
    while (tmp < k && ans.a[tmp] < m) tmp++;
    k = tmp;
    cout << k;
    for (int i = 0; i < k; i++) cout << " " << ans.a[i] + 1;
    cout << "\n";
  }
  return 0;
}
