program t1;

var

set1:array[1..5000]of integer;

m,n,p:integer;

i,j:integer;

function find(k:integer):integer;

begin

exit(set1[k]);

end;

procedure merge(a,b:integer);

var

i:integer;

begin

for i:=1 to n do

if set1[i]=b then set1[i]:=a;

end;

procedure init;

var

a,b:integer;

begin

readln(n,m,p);

fillchar(set1,sizeof(set1),0);

for i:=1 to n do

set1[i]:=i;

for i:=1 to m do

begin

readln(a,b);

merge(a,b);

end;

end;

var

a,b:integer;

begin

init;

for i:=1 to p do

begin

readln(a,b);

if find(a)=find(b) then

writeln('Yes') else writeln('No');

end;

end.