Question

how is insulin administered? orally intramuscularly intradermally subcutaneously

Explanation:

Insulin is a protein - like hormone. If taken orally, it will be broken down by the digestive enzymes in the gastrointestinal tract, so it can't be administered orally. Intramuscular injection is not the usual way for insulin administration. Intradermal injection is also not the standard route for insulin. Insulin is typically administered subcutaneously because this route allows for a relatively slow and steady absorption of insulin into the bloodstream, which is suitable for regulating blood glucose levels.

Answer:

Subcutaneously (the option "Subcutaneously" is the correct way of insulin administration among the given options. If we follow the option format as in the question, assuming the options are labeled (though not labeled in the given text, but for clarity):

If we consider the options as:

A. Orally

B. Intramuscularly

C. Intradermally

D. Subcutaneously

Then the answer is D. Subcutaneously)