Jonas Salk is credited with discovery of polio vaccine. He tested the vaccine for the first time on whom?

Options :
  1. Cat
  2. Dog
  3. Himself,wife and 3 sons
  4. Sheep
Answer and Explanation :-

Answer: Option 3

Explanation:

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La rutina no está tanto en las cosas como en nuestra incapacidad para crear a cada momento un vínculo original con ellas, en nuestra tendencia a leerlas por la falsilla de lo rutinario, de lo ya aprendido. Hay que seguir dejando siempre abierta la puerta al cuarto de jugar.
-Carmen Martín Gaite El cuento de nunca acabar.