'बुलिमिया नर्वोसा' से 'हाइपोकैलेमिया' नामक एक विशिष्ट इलेक्ट्रोलाइट असंतुलन हो सकता है, जो किसकी कमी है?

Given below are two statements: one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): Patients diagnosed with Type 1 Diabetes Mellitus require lifelong insulin therapy. Reason (R): Type 1 Diabetes Mellitus is characterized by an autoimmune destruction of pancreatic β-cells, leading to an absolute deficiency of insulin. In light of the above statements, choose the most appropriate answer:

A 6-year-old child presents with an abnormal gait. On examination, when the child stands on the affected limb, the pelvis drops on the opposite side. The affected leg also appears shorter. Which clinical sign is being assessed?