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: Pharmacology
Which of the following acts on nuclear receptors? 
Select and explain. 
A. GABA, B. Insulin, C. α1 - receptor, D. Thyroxine
D: Thyroxine
Answer: D: Thyroxine 
Explanation: Nuclear receptors : Thyroxine, Estrogen, Vitamin D, Vitamin A, Testosterone.
Cytoplasmic receptors : Glucocorticoids, Mineralocorticoids.