#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define F first
#define S second
using namespace std;
int N, M, Q, K, t, ans[100005], pre[100005], C[100005], dep[100005], head[100005], sz[100005], tableE[200005][20], bit[200005];
pii io[100005], tableD[100005][20];
vector<int> E[100005], euler = {-1};
vector<pii> qu[100005];
vector<pii> chain[100005];
void modify(int pos, int val)
{
if(pos == 0)
return;
for (int i = pos; i <= M; i += (i & -i))
bit[i] += val;
}
int query(int pos)
{
int val = 0;
for (int i = pos; i > 0; i -= (i & -i))
val += bit[i];
return val;
}
void dfs(int u)
{
euler.emplace_back(u);
io[u].F = ++t;
for (auto v : E[u])
if(v != pre[u])
{
pre[v] = u;
dep[v] = dep[u] + 1;
dfs(v);
sz[u] += sz[v];
++t;
euler.emplace_back(u);
}
sz[u]++;
io[u].S = t;
}
void hld(int u, int r)
{
head[u] = r;
int mxz = 0, mi = 0;
for (auto v : E[u])
if(v != pre[u])
if(sz[v] > mxz)
mi = v, mxz = sz[v];
for (auto v : E[u])
if(v != pre[u])
hld(v, (v == mi ? r : v));
}
signed main()
{
ios::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
cin >> N >> M >> Q;
E[0].emplace_back(1);
for (int i = 1; i < N; i++)
{
int u, v;
cin >> u >> v;
E[u].emplace_back(v);
E[v].emplace_back(u);
}
for (int i = 1; i <= M; i++)
cin >> C[i];
pre[0] = -1;
dfs(0);
hld(0, 0);
K = euler.size() - 1;
for (int i = 1; i <= K; i++)
tableE[i][0] = dep[euler[i]];
for (int p = 0; p + 1 < 20; p++)
for (int i = 1; i + (1 << p) <= K; i++)
tableE[i][p + 1] = min(tableE[i][p], tableE[i + (1 << p)][p]);
for (int i = 1; i <= M; i++)
tableD[i][0] = io[C[i]];
for (int p = 0; p + 1 < 20; p++)
for (int i = 1; i + (1 << p) <= M; i++)
tableD[i][p + 1].F = min(tableD[i][p].F, tableD[i + (1 << p)][p].F),
tableD[i][p + 1].S = max(tableD[i][p].S, tableD[i + (1 << p)][p].S);
for (int i = 1; i <= Q; i++)
{
int L, R;
cin >> L >> R;
qu[R].emplace_back(pii(L, i));
}
for (int r = 1; r <= M; r++)
{
int u = C[r], h;
while (u != -1)
{
h = head[u];
while (!chain[h].empty() && dep[chain[h].back().F] <= dep[u])
{
auto [v, j] = chain[h].back();
int val = dep[v] - dep[h] + 1;
modify(j, -val);
chain[h].pop_back();
if (!chain[h].empty())
{
j = chain[h].back().S;
modify(j, val);
}
}
int val = dep[u] - dep[h] + 1;
modify(r, val);
if (!chain[h].empty())
{
int j = chain[h].back().S;
modify(j, -val);
}
chain[h].emplace_back(pii(u, r));
u = pre[h];
}
for (auto [l, idx] : qu[r])
{
int lg = __lg(r - l + 1);
pii iot = pii(min(tableD[l][lg].F, tableD[r - (1 << lg) + 1][lg].F),
max(tableD[l][lg].S, tableD[r - (1 << lg) + 1][lg].S));
lg = __lg(iot.S - iot.F + 1);
int lca = min(tableE[iot.F][lg], tableE[iot.S - (1 << lg) + 1][lg]);
ans[idx] = query(r) - query(l - 1) - lca;
}
}
for (int i = 1; i <= Q; i++)
cout << ans[i] << '\n';
}
