PROTEIN_A_WILL_FOLD_INTO_ITS_NATIVE_STATE_ONLY_WHEN_PROTEIN_B_IS_ALSO_PRESENT_IN_THE_SOLUTION._HOWEVER_PROTEIN_B_CAN_FOLD_ITSELF_INTO_NATIVE_CONFIRMATION_WITHOUT_THE_PRESENCE_OF_PROTEIN_A._WHICH_OF_THE_FOLLOWING_IS_TRUE??$

• A. Protein B serves as precursor for protein A
• B. Protein B serves as molecular chaperon for protein A
• C. Protein B serves as ligand for protein A
• D. Protein B serves as structural motif for protein A