#include<cstdio>
const int MAXN=20000+5;
int father[MAXN];
int find(int x){return x==father[x]?x:father[x]=find(father[x]);}
void merge(int x,int y){father[find(x)]=find(y);}
int main()
{
	int n,m,q,x,y;
	scanf("%d %d %d",&n,&m,&q);
	for(int i=1;i<=n;i++)
		father[i]=i;
	for(int i=1;i<=m;i++)
	{
		scanf("%d %d",&x,&y);
		merge(x,y);
	}
	for(int i=1;i<=q;i++)
	{
		scanf("%d %d",&x,&y);
		printf("%s\n",find(x)==find(y)?"Yes":"No");
	}
	return 0;
}