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': 'All of the following are peptide-based except \nSelect and explain. \nA. ACTH, B. GnRH, C. Thyroxin, D. TRH', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Thyroxin is a lipid-soluble hormoneRef: DM Vasudevan, 7th edition, page no: 672', 'role': 'assistant'}]