43689
Another key to finding the correct structure of DNA was the so-called Chargaff ratios , experimentally determined ratios of the nucleotide subunits of DNA : the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine .
 person: Chargaff
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Chargaff 
Answer:
 person: Chargaff