Tetany is caused by:

 # Tetany is caused by:
A. Hyperglycemia 
B. Hypocalcemia 
C. Clostridium tetani 
D. Low oxygen level

The correct answer is B. Hypocalcemia.

Tetany is a condition characterized by involuntary muscle contractions, cramps, and spasms. The primary cause of tetany is hypocalcemia, which is a low level of calcium in the blood. Calcium plays a crucial role in muscle contraction and nerve function. When calcium levels are low, nerves become hyperexcitable, leading to the uncontrolled muscle contractions seen in tetany.

Hyperglycemia (A): High blood sugar levels are associated with diabetes, not tetany.
Clostridium tetani (C): This bacterium causes tetanus, a different condition characterized by muscle stiffness and spasms.
Low oxygen level (D): While low oxygen can cause various symptoms, it is not the primary cause of tetany.

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