The secretion of which gland helps in the lubrication of the penis

The correct option is A Bulbourethral gland
Accessory glands
The glands associated with the reproduction which helps in the formation of seminal plasma is called accessory glands. It include the following:

• Prostate gland
• Bulbourethral glands
• Seminal vesicles

Seminal vesicle
Seminal vesicle is a paired gland located near the base of the urinary bladder. It produces alkaline secretions and contributes $60\%$ to the semen.

Bulbourethral gland
Bulbourethral gland or Cowper’s gland is also a paired gland located on either side of the proximal portion of urethra. They secrete mucus which help in the lubrication of the penis.

Prostate gland
Prostate gland is a single gland that surrounds the proximal portion of the urethra. The slightly acidic milky secretions of this gland nourishes the sperms and aids in their motility.

Final answer (B) Bulbourethral gland