This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
Which of the following is the commonest side effect of the procedure shown below? 
Select and explain. 
A. Neck stiffness, B. Persistent clonus, C. Retrograde amnesia, D. Arrhythmia
C: Retrograde amnesia
Answer: C: Retrograde amnesia 
Explanation: Adverse Effects of ECT A. Memory disturbances: it is the most common side effect of ECT. Both retrograde andanterograde amnesia is seen.retrograde amnesia is much more common.B. Headache, muscle aches, fractures (very rare with modifiedECT), nausea and vomiting.