Fatigue is caused because of formation and depositing of which among the following acids in Muscles?

Q. Fatigue is caused because of formation and depositing of which among the following acids in Muscles?
Answer: Lactic Acid
Notes: Fatigue is caused because of formation and depositing of Lactic acid, or lactate which is a chemical by product of anaerobic respiration which is the process by which cells produce energy without oxygen around.