1751
Although lung specimens were lacking from these three patients , it is suggested that the pulmonary toxicity of CCNU may be dose - related .
 pulmonary toxicity, CCNU
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 pulmonary toxicity, CCNU