ID₅₀ Refers to __________________________, While LD₅₀ Refers to _____________________________

ID₅₀ refers to __________________________, while LD₅₀ refers to _____________________________.

A) infectious dose/lethal dose
B) number of microbes required to cause disease in 50% of test subjects/number of microbes required to cause death in 50% in 50% of test subjects.
C) number of sick test subjects/number of dead teste subjects
D) effectiveness of microbes to cause disease/effectiveness of microbes to cause death