n, m, p = map(int, input().split())
f = [i for i in range(n+1)] 
def find(x):
    if(f[x]!=x):  f[x] = find(f[x])
    return f[x]
def union(a, b):
    a = find(a)
    b = find(b)
    if(a != b):  f[a] = b
for _ in range(m):
    a, b = map(int, input().split())
    union(a, b)
for _ in range(p):
    i, j = map(int, input().split())
    print("Yes" if find(i)==find(j) else "No")