Final answer:
None of the options provided are both concentrated and an amide local anesthetic. Lidocaine, not listed in the options, is a commonly used amide local anesthetic.
Step-by-step explanation:
The question is asking which compound is a concentrated amide local anesthetic. Among the options given, B. dibucaine is not an amide anesthetic; cocaine (A) is an alkaloid and not an amide. Procaine (C) and tetracaine (D) are both esters, not amides. Procainamide (E) is indeed an amide, but it is an antiarrhythmic agent rather than a local anesthetic. Therefore, none of the options provided are both concentrated and an amide local anesthetic. In the context of clinical use, lidocaine is a commonly used amide local anesthetic, though it is not listed among the options provided.