Which is not true with regards to hypermagnesemia?

• A. it is nearly always seen in renal failure
• B. it causes nausea, vomiting, loss of deep tendon reflexes, drowsiness and hypotension
• C. it causes hypocalcemia
• D. if an overdose is taken, Calcium should be given as it is direct antagonist of magnesium
• E. it causes widening of the QRS