Q. A 12-year-old male is brought to the clinic by his mother with concerns of early puberty and short stature. The mother has noticed that her son had started to develop pubic and axillary hair, and had experienced a growth spurt over the past year, but had not seen any significant growth in height over the past few months. The patient had also recently started to experience some acne. He has no significant medical history and has been generally healthy. There is no family history of early puberty or endocrine disorders. On physical examination, the patient appears well and is in no acute distress. His vital signs are within normal limits. Height is measured at 4 feet, which is below the 5th percentile for his age and gender. Tanner stage 2 is noted by the presence of pubic hair and testicular volume within normal range for his age. There is no gynecomastia or galactorrhea noted on examination. Thyroid, lymph nodes and abdominal examination is unremarkable. Given the patient's presenting symptoms, a preliminary diagnosis of early puberty and short stature is made. Base on the information you have at this point in time, which of the following medications is the best choice for initial therapy?