DPT – Diphtheria Pertussis Tetanus, it is also referred to as DTP and is the name of a vaccine against the three named diseases.
DDT – Dichlorodiphenyltrichloroethane, it is a commonly used colorless, odorless insecticide.
BCG – Bacillus Calmette–Guérin is a popular vaccine used to counter tuberculosis or leprosy.