This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal Muscle: Contraction and Excitation, Subject name: Physiology
Sorensess and pain in muscels after vigrous exercise is due to - 
Select and explain. 
A. Hyperkalemia, B. Lactic acidosis, C. Hyperthermia, D. Hyponatremia
B: Lactic acidosis
Answer: B: Lactic acidosis 
Explanation: Ans. is 'b' i.e., Lactic acidosis o Immediate-onset Soreness is characterized by pain during and immediately after exercise.o This type of soreness is thought to be caused by stimulation of pain receptors by metabolic by-products of cellular respiration, especially H+ associated with incereased lactic acid levels.