If somebody develops resistance to INH, patient will develop simultaneously resistance to which drug?

Ref: KD Tripathi, 7th ed. pg. 767* Rifampicin is considered as effective as isoniazid. This agent is active against slow and intermittently dividing bacterium (spurters).* If someone develops resistance to INH, they are most likely to develop resistance to rifampicin as well.* In MDR-TB, there is resistance to INH and rifampicin.