35 year old man comes to the physician because of severe midline back pain during the past 4 weeks. he has gained 8kg(18lb) during the past 6 months. visual field testing shows decreased peripheral vision in both eyes. an x-ray of the chest shows compression fractures at t10 and l1. there is a healing left rib fracture posteriorly at t8. imaging studies show a pituitary macroadernoma. the most likely cause of his condition is a tumor producing which of the following hormones?
a. acthb. growth hormonec. luteinizing hormoned. prolactine. thyroid-stimulating hormone.

 the correct answer is A. ACTH

Explanation:

ACTH  stands for Adrenocorticotropic hormone  Adrenocorticotropic hormone (ACTH, also adrenocorticotropin, corticotropin) is an important component of the hypothalamic-pituitary-adrenal axis and is often produced in response to biological stress (along with its precursor corticotropin-releasing hormone from the hypothalamus). Its principal effects are increased production and release of cortisol by the cortex of the adrenal gland. ACTH is also related to the circadian rhythm in many organisms.

what is the aerea shown

explanation:

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).