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
During the journey of a sperm for feilization with an ovum, the process 'capacitation' takes place in: 
Select and explain. 
A. Vas deferens, B. Uterus, C. Epididymis, D. Testis
B: Uterus
Answer: B: Uterus 
Explanation: Once ejaculated into the female, the spermatozoa move up the uterus to the isthmus of the uterine tubes, where they slow down and undergo capacitation. This fuher maturation process involves two components: increasing the motility of the spermatozoa and facilitating their preparation for the acrosome reaction. From the isthmuses the capacitated spermatozoa move rapidly to the tubal ampullas, where feilization takes place. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 23. Function of the Male Reproductive System. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e.