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Because these exosomes are able to cross the blood brain barrier , this protocol could solve the problem of poor delivery of medications to the central nervous system , and potentially treat Alzheimer 's disease , Parkinson 's disease , and brain cancer , among other conditions .
 Alzheimer 's disease, Parkinson 's disease
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Alzheimer 's disease, Parkinson 's disease