A35 year old man is treated by ultraviolet light for a chronic skin rash characterized by patches of thickened skin with silver scales on the knees and elbows. this condition is .

Asubstitute is standing at the halfway line waiting to enter the match at the next stoppage of play the ball has gone over the touchline for throwing and referee allows for the substitution to substitute wants to take the throw-in does the substitute first have to enter the field of play before being allowed to take the throw-in