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: Medicine
[{'content': 'Testicular descent is controlled in pa by \nSelect and explain. \nA. Insulin like factor 3(INL 3), B. RANKL, C. FSH, D. LH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Testicular descent through the inguinal canal is controlled in pa by Leydig cell production of insulin-like factor 3 (INSL3), which acts a receptor termed GREAT ( G protein-coupled receptor affecting testis descent). Ref Harrison 20th edi page no 2769', 'role': 'assistant'}]