4685
Our results revealed that the fetal Leydig cells synthesize only androstenedione because they lack expression of Hsd17b3 , and fetal Sertoli cells convert androstenedione to testosterone , whereas adult Leydig cells synthesize testosterone by themselves .
 Chemical: androstenedione; Chemical: androstenedione; Chemical: testosterone; Chemical: testosterone
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: androstenedione, androstenedione, testosterone, testosterone 
Answer:
 Chemical: androstenedione; Chemical: androstenedione; Chemical: testosterone; Chemical: testosterone