What did Polish biologist Rudolf Weigl invent?

the first effective vaccine against typhus
medicine for cancer of the skin
diphtheria vaccine
EEG test method
Rudolf Stefan Weigl (2 September 1883 – 11 August 1957) was a Polish biologist and inventor of the first effective vaccine against epidemic typhus. He founded the Weigl Institute in Lviv, where he conducted vaccine research. There, during the Holocaust, he harbored Jews, thereby risking execution by the Germans.
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the first effective vaccine against typhus
medicine for cancer of the skin
diphtheria vaccine
EEG test method
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