3272
Of the three unilateral tumours , only one retained the paternal RB1 allele .
 Disease: unilateral tumours
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: unilateral tumours 
Answer:
 Disease: unilateral tumours