Which one of the following is ‘non-invasive’?

A non-invasive therapy is one that does not involve: Surgery Instruments entering the body Physical penetration Use of chemicals or radiation inside the body Psychotherapy is completely non-invasive because it works through: Counselling Talk therapy Behaviour modification Cognitive techniques The other options are invasive: Biological therapy → involves medicines, injections Radiotherapy → uses radiation Chemotherapy → uses chemical drugs Hence, the only non-invasive method is Psychotherapy.