This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
Which of the following is NOT true about electroconvulsive therapy (ECT)? 
Select and explain. 
A. Mainly used for the treatment of major depressive disorder, B. No absolute contraindications to the use of ECT, C. Should not be used in pregnancy, D. Pheochromocytoma is a relative contraindication
C: Should not be used in pregnancy
Answer: C: Should not be used in pregnancy 
Explanation: Between 80% and 90% of all ECT treatments are performed for the treatment of major depressive disorder. There are no absolute contraindications to the use of ECT. With appropriate preparation, ECT can be used effectively and safely in both pregnant and elderly patients. Pheochromocytoma is a relative contraindication for ECT. Ref: Loosen P.T., Shelton R.C. (2008). Chapter 18. Mood Disorders. In M.H. Ebe, P.T. Loosen, B. Nurcombe, J.F. Leckman (Eds), CURRENT Diagnosis & Treatment: Psychiatry, 2e.