What is the empirical formula of benzene, C6H6?

Question

I know how to find empirical formula; as long as you know the moles, you can find the ratio and thus the empirical formula. But the question provides nothing and I can only find the Mr?
The answer from the answer booklet is CH.

How is this answer obtained?

Answer 1

empirical: CH
Empirical is the lowest whole ratio of atoms.