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: Physiology
Thyroid hormone acts through receptors present on 
Select and explain. 
A. Cell membrane, B. Cytoplasmic membrane, C. Nuclear membrane, D. DNA
C: Nuclear membrane
Answer: C: Nuclear membrane 
Explanation: Thyroid hormoneEither of two hormones, thyroxine (T4) or triiodothyronine (T3, secreted by the follicles of the thyroid gland. They act on receptors in tissues throughout the body to increase the production of cellular proteins, the metabolic rate, and the activities of the sympathetic nervous system.Ref: Ganong&;s review of medical physiology; 24th edition; page no: 341