56535
The concept of the adrenal medulla and the sympathetic nervous system being involved in the flight , fight and fright response was originally proposed by Cannon .
 Cannon
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:
 Cannon