#include <bits/stdc++.h>
using namespace std;
const int MX = 100005, lg = 17;
int n, m, Q, L[MX], SP[lg + 1][MX];
vector<int> G[MX], V[lg + 1][MX];
void dfs(int u) {
  for (auto v : G[u]) {
    if (!L[v]) {
      L[v] = L[u] + 1, SP[0][v] = u;
      dfs(v);
    }
  }
}
void _merge(vector<int>& v1, vector<int>& v2) {
  for (auto i : v2) {
    v1.push_back(i);
  }
  sort(v1.begin(), v1.end());
  while (v1.size() > 10) {
    v1.pop_back();
  }
}
void build_sptbl() {
  for (int i = 1; i <= lg; i++) {
    for (int j = 1; j <= n; j++) {
      SP[i][j] = SP[i - 1][SP[i - 1][j]];
      V[i][j] = V[i - 1][j];
      _merge(V[i][j], V[i - 1][SP[i - 1][j]]);
    }
  }
}
vector<int> query(int u, int v) {
  vector<int> ret;
  if (L[u] < L[v]) swap(u, v);
  for (int i = lg; i >= 0; i--) {
    if (L[SP[i][u]] >= L[v]) {
      _merge(ret, V[i][u]);
      u = SP[i][u];
    }
  }
  for (int i = lg; i >= 0; i--) {
    if (SP[i][u] != SP[i][v]) {
      _merge(ret, V[i][u]);
      _merge(ret, V[i][v]);
      u = SP[i][u], v = SP[i][v];
    }
  }
  if (u != v) {
    _merge(ret, V[0][u]);
    _merge(ret, V[0][v]);
    u = SP[0][u], v = SP[0][v];
  }
  _merge(ret, V[0][u]);
  return ret;
}
int main() {
  scanf("%d %d %d", &n, &m, &Q);
  for (int i = 1, u, v; i < n; i++) {
    scanf("%d %d", &u, &v);
    G[u].push_back(v);
    G[v].push_back(u);
  }
  for (int i = 1, a; i <= m; i++) {
    scanf("%d", &a);
    if (V[0][a].size() <= 10) V[0][a].push_back(i);
  }
  L[1] = 1;
  dfs(1);
  build_sptbl();
  while (Q--) {
    int u, v, a;
    scanf("%d %d %d", &u, &v, &a);
    vector<int> ans = query(u, v);
    int sz = min(a, (int)ans.size());
    printf("%d", sz);
    for (int i = 0; i < sz; i++) {
      printf(" %d", ans[i]);
    }
    printf("\n");
  }
  return 0;
}
