This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Physiology
Mullerian inhibiting substance secreted by 
Select and explain. 
A. Stroma, B. Seoli cells, C. Leydig cells, D. All of the above
B: Seoli cells
Answer: B: Seoli cells 
Explanation: -Form blood-testis barrier -Nourishes developing sperm Spermatogenesis -Secrete testosterone under LH influence -Synthesis of Mullerian inhibiting Factor -Secrete inhibin which inhibits FSH Testosterone exes negative feedback on LH & GNRH