The common causes of lactic acidosis are as follows except A: Shock B: Hypoxia C: Cardiac arrest D: Respiratory failure E: Severe starvation

The main mechanism of metabolic acidosis in the late stage of chronic renal failure is ( ) A: Decreased non-volatile acid excretion due to decreased CFR function B: Decreased excretion of H+ and ammonia production in renal tubules C: Decreased HCO3- reabsorption threshold in renal tubules D: Effects of hyperkalemia E: Increased lactic acid production