3825
Study of the role of vitamin B12 and folinic acid supplementation in preventing hematologic toxicity of zidovudine .
 vitamin B12, folinic acid, toxicity, zidovudine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 vitamin B12, folinic acid, toxicity, zidovudine