[单选题]
Which hormone is secret(dwup:uourm ,u/ 1h2a ed by9g- tyze+5s- y6 +2ws8 (htlmtgahzw s the gland labeled X?
A. Leptin
B. Thyroxine
C. Progesterone
D. Melatonin
参考答案: D
本题详细解析: Explanation:
Choice D is correct because the gland X is the pineal gland and it produces melatonin. Choice A is incorrect because leptin is produced by adipose tissue. Choice B is incorrect because thyroxine is produced by the thyroid gland. Choice C is incorrect because progesterone is produced by ovaries.
