1702
To understand the in vivo relevance of this metabolic pathway , rats were dosed with PT and Rib - C2 was found in the urine .
 Chemical: Rib
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Rib 
Answer:
 Chemical: Rib