Type B Lactic acidosis is due to

Lactic Acidosis:An increase in plasma l-lactate may be secondary to poor tissue perfusion (type A)--circulatory insufficiency (shock, cardiac failure), severe anemia, mitochondrial enzyme defects, and inhibitors (carbon monoxide, cyanide)--or to aerobic disorders (type B)-- malignancies, nucleoside analogue reverse transcriptase inhibitors in HIV, diabetes mellitus, renal or hepatic failure, thiamine deficiency, severe infections (cholera, malaria), seizures, or drugs/toxins (biguanides, ethanol, methanol, propylene glycol, isoniazid, and fructose).Reference: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 66; Acidosis and Alkalosis