<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 16-year-old girl comes to the physician because of a 3-week history of nausea, increased urinary frequency, and breast tenderness. She has never had a menstrual period. She is actively involved in her schools track and field team. She is 173 cm 5 ft 8 in tall and weighs 54 kg 120 lb; BMI is 18 kgm2. Her breast and pubic hair development are at Tanner stage 5. Which of the following serum assays is the most appropriate next step in the diagnosis of this patients condition?? A: Estriol, B: Thyrotropin, C: Human chorionic gonadotropin, D: Luteinizing hormone, E: Prolactin,  <response>: This is a clinical case of a 16-year-old girl presenting with symptoms of nausea, increased urinary frequency, and breast tenderness. She has never had a menstrual period before. She is physically active and has normal growth parameters. Her breast and pubic hair development indicate she has gone through puberty. The key findings here are:- Post-pubertal teenage girl - Amenorrhea no menstrual periods- Pregnancy-related symptoms like nausea, urinary frequency, and breast tendernessThis clinical presentation is highly suspicious for pregnancy. The most appropriate diagnostic test would be a serum beta-hCG human chorionic gonadotropin level to confirm pregnancy. Estriol and prolactin are not useful tests in this scenario. Thyrotropin may be checked to rule out thyroid disorders but is not the most appropriate next step. Luteinizing hormone can help evaluate ovarian function but a pregnancy test is the priority here.C: Human chorionic gonadotropin 