This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Periodic paralysis is seen in the setting of hypokalemia, known as hypokalemic periodic paralysis. Similar type of paralysis is seen in the setting of: 
Select and explain. 
A. Hypothyroidism, B. Thyrotoxicosis, C. Hypoadrenalism, D. Cushing syndrome
B: Thyrotoxicosis
Answer: B: Thyrotoxicosis 
Explanation: Hypokalemic periodic paralysis is a familial condition caused by missense mutations of voltage sensor domains within L-type calcium channels or the skeletal Na+ channel. Must know: Thyrotoxic Periodic Paralysis: Redistributive hypokalemia occurs in the setting of hypehyroidism. It can cause periodic attacks of hypokalemic paralysis - (TPP). Patients typically present with weakness of the extremities and limb girdles. Paralytic episodes occur most frequently between 1 and 6 a.m. Signs and symptoms of hypehyroidism are usually not seen. Ref: Harrison, Edition-18, page- 352.