When managing this patient, which drug group is it most similar to?

A 23-year-old man is taken to the Emergency Department by his friends after a night out. He was found acting erratically outside a nightclub as they were waiting for a taxi. His friend reports that they snorted a white powder two hours earlier. This is described as ‘M-CAT’, a ‘legal high’ they obtained from the internet.

When managing this patient, which drug group is it most similar to?

Ketamine
Amphetamine
Opioid
Benzodiazepine
LSD