All the following antihistamines are derivatives of ethylene diamines EXCEPT?

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Question 7: All the following antihistamines are derivatives of ethylene diamines EXCEPT?

• A. Clemizole (Ethylenediamine derivative)
• B. Cyclizine (Piperazine derivative)
• C. Hydroxyzine (Piperazine derivative)
• D. Doxylamine (Ethanolamine derivative)

Based on standard chemical classification, Clemizole is an ethylenediamine derivative. Cyclizine and Hydroxyzine are piperazine derivatives, and Doxylamine is an ethanolamine derivative. Since the question asks for the exception and only one answer can be chosen, and all B, C, and D are not ethylenediamine derivatives, there might be a specific context