<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A previously healthy 13-year-old boy is brought to the physician because of a lump beneath his right nipple that he discovered 1 week ago while showering. He has allergic rhinitis treated with cetirizine. He is at the 65th percentile for height and 80th percentile for weight. Examination shows a mildly tender, firm, 2-cm subareolar mass in the right breast; there are no nipple or skin changes. The left breast shows no abnormalities. Sexual development is Tanner stage 3. Which of the following is the most likely explanation for this patients breast lump?? A: Leydig cell tumor, B: Adverse effect of medication, C: Invasive ductal carcinoma, D: Normal development, E: Hyperprolactinemia,  <response>: This is a clinical case about a 13-year-old boy who has discovered a lump beneath his right nipple. The key findings are:- 13-year-old boy - Lump beneath right nipple discovered 1 week ago- No nipple or skin changes- Left breast normal- Tanner stage 3 sexual development- Otherwise healthy with no concerning medical historyThe question asks to identify the most likely explanation for the breast lump in this patient. Based on the clinical presentation, the most likely diagnosis would be a benign condition consistent with normal pubertal changes rather than a malignant or hormonal condition. The lump is likely gynecomastia, which is benign breast tissue enlargement that can develop in adolescent boys as their hormones fluctuate during puberty. Leydig cell tumor, breast cancer, and hyperprolactinemia would all be unlikely in an otherwise healthy adolescent boy. An adverse medication effect is also unlikely given his only medication is cetirizine, an antihistamine not known to cause gynecomastia.D: Normal development 