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Sir Frederick Banting of Toronto and Charles Best discovered which hormone?

  1. Adrenaline

  2. Insulin

  3. Estrogen

  4. Cortisol

The correct answer is: Insulin

Sir Frederick Banting and Charles Best discovered insulin. Adrenaline, estrogen, and cortisol were all discovered by different scientists and are not correct in this context. Adrenaline was discovered by Japanese chemist Jokichi Takamine, Estrogen was discovered by German chemist Adolf Butenandt, and cortisol was discovered by Hungarian biochemist Tadeus Reichstein.