This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy & Physiology (Testis & Scrotum), Subject name: Surgery
Reinke's crystals are seen in? 
Select and explain. 
A. Leydig cells, B. Sertoli cells, C. Curschmann spirals, D. Creola bodies
A: Leydig cells
Answer: A: Leydig cells 
Explanation: Ans. (a) Leydig cellsRef: Bailey & Love 26th ed. /1341Rectangular, crystal-like inclusions, composed of protein, with pointed or rounded ends in the interstitial cells of the testis (Leydig cells) and hilus cells in the ovary. Inside the Leydig cells of human males can be found Reinkes crystals. The purpose of these crystals is uncertain, some believe that they are a by-product of a degenerative process related to aging. They appear to have no contribution to androgen or testosterone production, and they can be used to identify Leydig cells easily when viewing testicular tissue under a microscope