Who is "they" here? There are completely separate committees for each subject's Nobel prize.
Edit: the individual committees are even not all run by the same institution [0]. The medicine prize committee is run from the Karolinska institute, whereas the physics committee, for example, is run by the Royal Swedish Academy of Sciences.
Edit: the individual committees are even not all run by the same institution [0]. The medicine prize committee is run from the Karolinska institute, whereas the physics committee, for example, is run by the Royal Swedish Academy of Sciences.
[0] https://www.nobelprize.org/the-nobel-prize-organisation/priz...