Myxedema Features

The correct answer is A

Explanation
The symptoms that she complains about: weakness, fatigue, and cold intolerance, constipation, and weight gain, can all be seen with hypothyroidism.The signs and laboratory findings are also consistent with myxedema.

Cretinism (choice b) is congenital hypothyroid. This is not the case here, as she developed the hypothyroidism later in her life.

Graves disease (choice c) would present with symptoms of hyperthyroidism rather than the symptoms of hypothyroidism, as the case here. Symptoms of hyperthyroidism would include weight loss, not weight gain; loose stools, not constipation; heat intolerance, rather than cold intolerance and a tachycardia rather than a bradycardia.
Jod-Basedow phenomenon (choice d) is hyperthyroidism cause by iodine ingestion.

Riedel's thyroiditis (choice e) can lead to hypothyroidism however, Riedel's thyroiditis would present with an enlarged, hard thyroid. The thyroid gland would be very firm to palpation.

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