1491
In order to investigate whether retained tendon reflexes are characteristic of FRDA caused by the second locus , FRDA2 , we studied an unrelated FRDA patient with retained tendon reflexes .
 FRDA, FRDA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 FRDA, FRDA