#include <bits/stdc++.h>
using namespace std;
 
#define REP(i,n) for(int i=0;i<(n);i++)
 
int main(){
  int n,m,q;cin>>n>>m>>q;
  vector<vector<long long>> v(n),g(n);
  REP(i,m){
    int a,b;cin>>a>>b;a=n-a;b=n-b;
    g[a].push_back(b);
  }
  REP(i,n){
    v[i].resize(i/64+1,0);
    v[i][i/64]=1LL<<(i%64);
    for(int p:g[i])REP(j,v[p].size())v[i][j]|=v[p][j];
  }
  REP(_,q){
    int a,b;cin>>a>>b;a=n-a;b=n-b;
    cout<<(v[a][b/64]&(1LL<<(b%64))?"Yes":"No")<<"\n";
  }
}
 

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