This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
In severe exercise, decrease in pH is due to 
Select and explain. 
A. Respiratory acidosis, B. Lactic acidosis, C. H+ retension, D. HC03- excretion
B: Lactic acidosis
Answer: B: Lactic acidosis 
Explanation: In case of sever exercise, lactic acid deposits in muscles due to anaerobic respiration by white muscle fibers, This results in fatigue Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number:96