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Type II major histocompatibility complex combined immune deficiency ( type II MHC CID or bare lymphocyte syndrome ) is a congenital immunodeficiency disease characterized by absent MHC class II expression .
 MHC, MHC class II, Type II major histocompatibility complex
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 MHC, MHC class II, Type II major histocompatibility complex