If the planet was attacked by a disease that caused people to lose the use of their frontal lobes, one way people might be affected is they may lose their self awareness.
This is an organ which is located in the head region and comprises of rich network of neurons which are enclosed in the cranium. It serves as the control center of the central nervous system and has different types of lobes such as frontal etc with unique functions.
The frontal lobe is located in the anterior part of the brain and is responsible for different types of voluntary movements and cognitive functions such as interaction, self awareness etc.
This is therefore the reason why frontal lobe was chosen as the most appropriate choice.
Read more about Frontal lobe here https://brainly.com/question/3031921
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