The correct option is post-traumatic stress disorder.

Direct answer

From the options

  • increased blood pressure
  • schizophrenia
  • unusual irritability
  • post-traumatic stress disorder

the psychological condition that is classically described as resulting from stress (specifically traumatic stress) is post-traumatic stress disorder (PTSD).

Why PTSD fits best

  • PTSD is defined as a mental health disorder that can develop after exposure to a highly stressful or traumatic event, such as violence, accidents, or disasters.
  • Research on chronic stress shows strong links between severe stress exposure and the onset of PTSD as well as other stress-related psychiatric conditions.

Why the other options are less appropriate

  • Increased blood pressure is mainly a physical or cardiovascular effect of stress, not a psychological disorder, even though stress can contribute to high blood pressure.
  • Schizophrenia is a serious psychotic disorder with complex biological and environmental causes; stress can worsen it but it is not typically described as resulting from stress in basic health questions.
  • Unusual irritability is a symptom commonly associated with stress, not a named psychological condition or disorder on its own.

So, for the question “which psychological condition may result from stress?”, the best answer is post-traumatic stress disorder.