<prompt> Which of the following is known as the medical discovery of 20th century?ZidovudineSmallpox vaccineORSPenicillin  <response>: Oral Rehydration Therapy O, a cheap and effective way to tackle moality from diarrohea Hence, it is The medical discovery of the century composition of Reduced Osmolarity ORS - Na 75 mmol L K 20 mmol L Cl- 65 mmolL Citrate 10 mmolL Glucose 75 mmolL Total 245 mmolL 