Pediatrics Endocrinology af7f979f 'Weak giants' are produced by: A Thyroid adenomas B Thyroid carcinomas C Parathyroid adenomas D Pituitary adenomas High-Yield Explanation d. Pituitary adenomas(Ref: Nelson's 20/e p 2714-2724)Hyperpituitarism causes tall stature (Giants), with weak muscles; Most common cause of Hyperpituitarism is Pituitary adenoma.