The correct answer is C. Obsessive-compulsive disorder
Explanation
Obsessive-compulsive disorder or OCD is a psychiatric or mental disorder in which people mainly shows compulsion or repetitive behaviors and obsession which become repetitive and automatic as the individual is unable to control these behaviors which leads to issues in the individual's daily life. Because of this, in OCDs behaviors such as counting certain elements compulsively, storing objects in a certain way, repetitive hand washing, doing certain actions a specific number of times and checking if the doors are locked over and over are common. Additionally, this type of disorder is linked to anxiety disorder as irrational anxiety and fears can lead to compulsions and disorders. Considering this, it can be concluded it is Obsessive-compulsive disorder the disorder that consists of behaviors such as repetitive hand washing, checking if doors are locked, etc.
Answer: a. supply nutrients and oxygen to the renal medulla.
Explanation:
Countercurrent exchange is a process that takes place in kidney creates a kind of concentration gradient so as to concentrate the urine by adding up urea and salt in the urine via renal medulla part of kidney.
