The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 6–month old boy weighing 3.2 kg presents with recurrent vomiting and polyuria. Investigations show blood area 60 mg/dl creatinine 0.7 mg/dL, calcium 12.8 mg/dL, phosphate 3 mg/dL, pH 7.45, bicarbonate 25 mEq/L and PTH 140 pg ml (normal <60 pg/ml). Daily urinary calcium excretion is reduced. Ultrasound abdomen show bilateral nephrocalcinosis. The most likely diagnosis is –   (A) Bartter syndrome   (B) Mutation of the calcium sensing receptor   (C) Ps eudo–ps eudohypoparathyroidism   (D) Parathyroid adenoma
['(B) Mutation of the calcium sensing receptor <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Bartter syndrome \n (B) Mutation of the calcium sensing receptor \n (C) Ps eudo–ps eudohypoparathyroidism \n (D) Parathyroid adenoma <> possible answers', '  A 6–month old boy weighing 3.2 kg presents with recurrent vomiting and polyuria. Investigations show blood area 60 mg/dl creatinine 0.7 mg/dL, calcium 12.8 mg/dL, phosphate 3 mg/dL, pH 7.45, bicarbonate 25 mEq/L and PTH 140 pg ml (normal <60 pg/ml). Daily urinary calcium excretion is reduced. Ultrasound abdomen show bilateral nephrocalcinosis. The most likely diagnosis is – <> context@']