A woman is brought into an emergency room after a severe automobile accident. She's unconscious and badly injured. Her husband arrives at the emergency room at the same time as she arrives in the ambulance. the doctor explains the wife's condition to her husband and asks for permission to operate on her.The husband agrees to the operation. The husband 's approval for the operation is called ________ consent
A. Mutual
B. Substituted
C. Contractual
D. Informed