During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is : (a) carbon dioxide (b) alcohol (c) lactose (d) lactic acid

During marathon, we sometimes get painful contractions of leg muscles

1.	During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is : (a) carbon dioxide (b) alcohol (c) lactose (d) lactic acid
Answer» During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is : (a) carbon dioxide (b) alcohol (c) lactose (d) lactic acid