<prompt> Lactate is formed in all exceptRBCLensBrainTestis  <response>: Anaerobic glycolysis does not occur in the brainTherefore lactate is not formed in the brainMost tissues have at least some requirement for glucose. In the brain, the requirement is substantial, and even in prolonged fasting, the brain can meet no more than about 20 of its energy needs from ketone bodies.Ref: Harper;s biochemistry; 30th edition; page no: 168 