This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thalamus, Hypothalamus and Basal Ganglia, Subject name: Physiology
Circadian rhythm is influenced by: 
Select and explain. 
A. Supra optic nuclei, B. Postero lateral nucleus, C. Ventro-lateral nucleus, D. Supra chiasmatic nucleus
D: Supra chiasmatic nucleus
Answer: D: Supra chiasmatic nucleus 
Explanation: Ans: D (Supra chiasmatic nucleus) Ref: W F Ganong. Central and Peripheral Neurophysiology. In: Review of Medical Physiology. 24th ed. California: McGraw-Hill Companies; 2012, p278.Explanation:Circadian rhythm is dependent on the supra-chias- matic nuclei (SCN) located bilaterally above the optic chiasm. (See Table 2 Below)