<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 15-year-old boy is brought to the physician for a well-child visit. His parents are concerned that he has not had his growth spurt yet. As a child, he was consistently in the 60th percentile for height; now he is in the 25th percentile. His classmates make fun of his height and high-pitched voice. His parents are also concerned that he does not maintain good hygiene. He frequently forgets to shower and does not seem aware of his body odor. As an infant, he had bilateral orchidopexy for cryptorchidism and a cleft palate repair. He is otherwise healthy. Vital signs are within normal limits. On physical exam, axillary and pubic hair is sparse. Genitals are Tanner stage 1 and the testicles are 2 mL bilaterally. Which of the following is the most likely diagnosis?? A: Hyperprolactinemia, B: Hypothyroidism, C: Primary hypogonadism, D: Kallmann syndrome, E: Constitutional delay of pubertyn,  <response>: This is a question about delayed puberty in a 15-year-old boy. The key findings are lack of growth spurt, short stature compared to peers, high-pitched voice, poor hygiene, history of cryptorchidism and cleft palate repair, sparse axillary and pubic hair, small testicular volume, and genitals at Tanner stage 1. The differential diagnosis includes:A Hyperprolactinemia - Unlikely, as this does not explain the other findings. Hyperprolactinemia can delay puberty but is not associated with cryptorchidism or cleft palate. B Hypothyroidism - Unlikely for similar reasons as hyperprolactinemia. Can cause delayed puberty but does not explain the other findings.C Primary hypogonadism - Unlikely as testicles are present, though small. Primary hypogonadism testicular failure would cause absence of testicles and genital development.D Kallmann syndrome - Most likely. It explains the delayedabsent puberty, cryptorchidism, cleft palate, lack of sense of smell, and small testicular size. Caused by deficiency in gonadotropin releasing hormone.E Constitutional delay of puberty - Less likely. Would expect normal testicular size and eventual spontaneous puberty. The cryptorchidism and cleft palate point more towards a congenital syndrome like Kallmann rather than constitutional delay.D: Kallmann syndrome 