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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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The following immunoglobulin DOES NOT fix to complement -
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The correct answer is  Complement is a complex of nine different fractions, C1 to C9. All classes of immunoglobulin do not fix complement. - only IgM,IgG 3,1 and 2 fix complement. - IgG 4, IgA, IgD or IgE do not fix complement Reference : Anathanarayan & paniker's 9th edition, pg no:120 <\p>