Final answer:
Nurse Ratched does not provide a formal diagnosis for McMurphy but uses her authority to try to diminish his will and control the ward. She relies on her power to commit him indefinitely and seeks to undermine his influence on the other patients after he begins to inspire them.
Step-by-step explanation:
In Ken Kesey's novel One Flew Over the Cuckoo's Nest, Nurse Ratched does not give Randle McMurphy a specific diagnosis. Instead, she perceives him as a threat to her authority within the mental institution. Nurse Ratched suggests a strategic method to dealing with McMurphy's defiance, which involves the endurance of her own power and the gradual chipping away at McMurphy's resolve.
Rather than actual medical treatment, her approach is manipulative and designed to weaken his influence on the other patients. She realizes that the longer McMurphy is committed under her care, the more control she can exert over him, trying to reclaim authority after McMurphy's acts of rebellion. This realization occurs after McMurphy succeeds in a particular defiance against her rules, which leads her to understand that he is inspiring hope and a desire for change amongst the patients, something she cannot condone.
Your question is incomplete, but most probably your full question was
What is Nurse Ratched's diagnosis for McMurphy? What does she suggest? Why?
*Reference: Ken Kesey's novel One Flew Over the Cuckoo's Nest).