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Rick Strassman has hypothesized that the pineal gland , which maintains light sensitivity , is responsible for the production and release of DMT ( dimethyltryptamine ) , an entheogen which he believes possibly could be excreted in large quantities at the moments of birth and death .
 Rick Strassman
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:
 Rick Strassman