The correct option is B Antithistamine
Terfenadine is an antihistamine formerly used for the treatment of allergic conditions. It was brought to market by Hoechst MArion Roussel(now Sanofi Aventis) and was marketed under various brand names including Seldane in United states, Triludan in United kingdom. It was superseded by fexofenadine in 1990s due to the risk of a particular type of disruption of the electrical rhythms of the heart and has been withdrawn from market.