I would say C, schizophrenia,
because schizophrenia is "a mental disorder that in many ways centers around not recognizing what is part of reality – namely, having psychotic breakdowns." It is not related to anxiety, as anxiety is classified as "neurotic" while schizophrenia is classified as "psychotic".
Answer:
b. narcissistic personality disorder
Explanation:
1. Fibromyalgia
2. dermatitis
3. Pneumonia
4. Endometriosis