Indicate Which Item in the Following Answer Code Best Matches

Indicate which item in the following answer code best matches the description in each question by writing the appropriate letter in the blank.
-Structure within which an ovum develops prior to ovulation

A) erection
B) acrosome
C) Leydig cells
D) seminal vesicles
E) oviduct
F) inner cell mass
G) seminiferous tubules
H) midpiece of sperm
I) head of sperm
J) prostate gland
K) trophoblast
L) corpus luteum
M) epididymis
N) ovarian follicle
O) ejaculation
P) tail of sperm
Q) Sertoli cells
R) endometrium
S) placenta