7070
Platinum ( Pt ) - based chemotherapy is an important regimen in the clinical treatment of cancer , but development of drug resistance presents a major challenge .
 Chemical: Platinum; Chemical: Pt
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Platinum; Chemical: Pt