Why would an excessive production of thyroid hormone cause the level of TSH to be low?

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Please select the single best answer

	A negative feedback loop exists that tells the pituitary to stop producing TSH when thyroid hormones are found in excess
	A positive feedback loop exists that tells the pituitary to produce more TSH when T3 or T4 is found in excess
	There is no hormonal connection between the thyroid and pituitary to regulate the production of TSH
	Normally the thyroid hormones T3 and T4 provide feedback only to the hypothalamus, and not the pituitary, so TSH remains low