#include <bits/stdc++.h>
using namespace std;
struct st {
  int arr[10];
  int sz;
  st() {
    sz = 0;
    for (int i = 0; i < 10; i++) {
      arr[i] = INT_MAX;
    }
  }
  st(int a) {
    for (int i = 0; i < 10; i++) {
      arr[i] = INT_MAX;
    }
    arr[0] = a;
    sz = 1;
  }
  st operator+(const st& b) {
    st z;
    int filled = 0, ap = 0, cp = 0;
    int tofill = min(sz + b.sz, 10);
    while (filled != tofill) {
      if (arr[ap] < b.arr[cp]) {
        z.arr[filled++] = arr[ap++];
      } else {
        z.arr[filled++] = b.arr[cp++];
      }
    }
    z.sz = filled;
    return z;
  }
};
const int N = 100001;
st nodeData[N];
int parent[N];
int num[N];
int L[N];
int vis[N];
st part[N][20];
vector<int> centroidTree[N];
vector<int> adj[N];
void addEdge(int u, int v) {
  adj[u].push_back(v);
  adj[v].push_back(u);
}
int sz[N];
void dfs(int s, int p = -1) {
  sz[s] = 1;
  for (auto c : adj[s]) {
    if (c == p || vis[c]) continue;
    dfs(c, s);
    sz[s] += sz[c];
  }
}
void dfsData(int s, int f, int p = -1, st cont = st()) {
  part[s][L[s] - L[f]] = cont;
  for (auto c : adj[s]) {
    if (c != p && (!vis[c])) {
      dfsData(c, f, s, cont + nodeData[c]);
    }
  }
}
int findCentroid(int s) {
  dfs(s, -1);
  int total = sz[s];
  int p = -1;
  for (int big = -1;; big = -1) {
    for (auto c : adj[s]) {
      if (c != p && (!vis[c])) {
        if (big == -1 || sz[big] < sz[c]) big = c;
      }
    }
    if (big == -1 || sz[big] * 2 <= total)
      break;
    else {
      p = s;
      s = big;
    }
  }
  return s;
}
int createTree(int s, int d = 0) {
  int ce = findCentroid(s);
  vis[ce] = true;
  L[ce] = d;
  for (auto ch : adj[ce]) {
    if (!vis[ch]) {
      int x = createTree(ch, d + 1);
      parent[x] = ce;
      centroidTree[ce].push_back(x);
    }
  }
  dfsData(ce, ce, -1, st());
  vis[ce] = false;
  return ce;
}
int lca(int u, int v) {
  while (u != v) {
    if (L[u] <= L[v])
      v = parent[v];
    else
      u = parent[u];
  }
  return u;
}
st query(int u, int v) {
  int _lca = lca(u, v);
  return part[u][L[u] - L[_lca]] + part[v][L[v] - L[_lca]] + nodeData[_lca];
}
void print(st a, int k) {
  int c = 0;
  for (int i = 0; i < 10; i++) {
    if (a.arr[i] != INT_MAX) c++;
  }
  c = min(c, k);
  printf("%d ", c);
  for (int i = 0; i < c; i++) {
    printf("%d ", a.arr[i]);
  }
  printf("\n");
}
int main() {
  srand(time(NULL));
  int n, m, q;
  scanf("%d%d%d", &n, &m, &q);
  for (int i = 0; i < n - 1; i++) {
    int u, v;
    scanf("%d%d", &u, &v);
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  for (int i = 1; i <= m; i++) {
    int x;
    scanf("%d", &x);
    nodeData[x] = nodeData[x] + st(i);
  }
  createTree(1);
  while (q--) {
    int u, v, k;
    scanf("%d%d%d", &u, &v, &k);
    print(query(u, v), k);
  }
  return 0;
}
