This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
[{'content': 'Estrogen receptors are seen in \nSelect and explain. \nA. Microsomes, B. Membrane bound, C. Nucleus, D. Mitochondria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The estrogen receptor (ER) is a ligand-activated enhancer protein that is a member of the steroid/nuclear receptor superfamily.Two genes encode mammalian ER: ERa and ERb.ER binds to specific DNA sequences called estrogen response elements (EREs) with high affinity and transactivates gene expression in response to estradiolRef: DM Vasudevan, 7th edition, page no: 57', 'role': 'assistant'}]