This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
Suicidal tendencies are seen in: 
Select and explain. 
A. Substance abuse, B. Post-traumatic stress disorder (PTSD), C. Schizophrenia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Depression, substance use disorders, schizophrenia, PTSD are all associated with increased suicide risk