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The twins , both qualified lawyers aged in their late 20s , are joined at the head and the operation involves separating two individually functioning brains encased within a single bony structure , neurosurgeon Keith Goh said in December .
 The twins, both qualified lawyers aged in their late 20s, their, neurosurgeon, neurosurgeon Keith Goh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 The twins, both qualified lawyers aged in their late 20s, their, neurosurgeon, neurosurgeon Keith Goh