Find the correct options.
(a) Testosterone influences male secondary sexual characters.
(b) Gestation period in Rabbit is about 276 days.
(c) The bulbourethral gland secretes a vaginal lubricant.
(d) Placenta secretes estrogen.

The correct option is C a, d
A) Testosterone is the male hormone which helps in the formation of sperms and male secondary sexual characters.

B) The gestation period of a rabbit is about 27 to 30 days.

C) Bulbourethral gland helps in lubrication of the penis.

D) Placenta secretes many hormones like human placental lactogen, human chorionic gonadotropin, estrogens, progesterone, etc.

So the correct option is 'a,d'.