Table: carnac_rna_prediction
Columns: name
number_of_sequences_number_of_sequences
alignment_alignment_predicts_an_alignment
structure_structure_predicts_structure
knots_knots_pseudoknot_prediction
link

Question: What is the pseudoknot prediction of the software named tfold?
SQL: SELECT "knots_knots_pseudoknot_prediction" FROM carnac_rna_prediction WHERE "name" = 'tfold'