<prompt> Three years back a woman suffered during an earthquake and she was successfully saved. After recovery, she has nightmares about the episode and she also gets up in the night and feels terrified. The most probable diagnosis is -Major depressionPost-traumatic stress disorderManiaSchizophrenia  <response>: Similar to previous question, nightmares about the episode intrusion of thoughts about event after a life threatening event earthquake suggest the diagnosis of PTSD. 