In general, who is used for people, and that for things. The wrench is the only tool that can remove the bolt. Mark is the only one who can help me with my homework.
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AnonymousHe is the only one who /that can help me .....Who or that which one is correct...?Both are correct. Many grammarians advise that that should be used if the antecedent includes the only but this rule isn't always adhered to.
Cool BreezeMany grammarians advise that that should be used if the antecedent includes the onlyInteresting. I had never heard this.
CalifJimCool BreezeMany grammarians advise that that should be used if the antecedent includes the onlyInteresting. I had never heard this.
CJ