A man on antipsychotic medicines develops features of retinitis pigmentosa. Which drug is most likely to cause these symptoms?

The key is A. Thioridazine. [Thioridazine and other antipsychotics (neuroleptics, dopaminergic antagonists) can cause degenerative retinopathies with histological, electrophysiological and symptomatological features similar to those of primary retinitis pigmentosa].