2535
Progressive hypoxemia mandated endotracheal intubation 1 week after rituximab administration and led to death 4 weeks after admission .
 adverse effect: Progressive hypoxemia, rituximab
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  Progressive hypoxemia, rituximab 
Answer:
 adverse effect: Progressive hypoxemia, rituximab