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: Physiology
Biological clock of brain is located in 
Select and explain. 
A. Preoptic nucleus, B. Lateral nucleus, C. Suprachiasmatic nucleus, D. Supraoptic nucleus
C: Suprachiasmatic nucleus
Answer: C: Suprachiasmatic nucleus 
Explanation: Ans. is 'c' i.e., Suprachiasmatic nucleus