The correct option is B Ovary
Relaxin
Relaxin is secreted by the corpus luteum in the ovary and the placenta. It relaxes the pelvic ligaments and widens the cervix for helping in childbirth.
Ovary and testes
Ovaries and testes are the primary sex organs. They produce gametes and sex hormones.
Adrenal gland
Adrenal glands are endocrine glands present over the kidneys just like a cap. They produce hormones called corticosteroids and catecholamines.
Pituitary gland
The pituitary gland is an endocrine gland attached to the hypothalamus of the brain that produces many tropic hormones which regulate other endocrine glands. Hormones secreted include adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinising hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL), growth hormone (GH), melanocyte-stimulating hormone (MSH), oxytocin and vasopressin.
Final answer
(A) Ovary