49519
The bicarbonate buffer system regulates the ratio of carbonic acid to bicarbonate to be equal to 1:20 , at which ratio the blood pH is 7.4 ( as explained in the Henderson–Hasselbalch equation ) .
 person: Henderson–Hasselbalch
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: Henderson–Hasselbalch 
Answer:
 person: Henderson–Hasselbalch