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Mutations in the HEXA gene , encoding the alpha - subunit of beta - hexosaminidase A ( Hex A ) , that abolish Hex A enzyme activity cause Tay - Sachs disease ( TSD ) , the fatal infantile form of G ( M2 ) gangliosidosis , Type 1 .
 Disease: Tay - Sachs disease; Disease: TSD; Disease: infantile form of G ( M2 ) gangliosidosis , Type 1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: Tay - Sachs disease; Disease: TSD; Disease: infantile form of G ( M2 ) gangliosidosis , Type 1