Which of the following is NOT a right of an arrested/detained person?

The right to remain silent during interrogation is a fundamental principle in criminal law, specifically intended to protect an individual's self-incrimination rights. However, in this context, the specific phrasing as a right of an arrested/detained individual may not be explicitly mentioned as one of the required rights in certain legal frameworks.

The other options refer to recognized and specific rights that are typically afforded to individuals who have been arrested or detained. For instance, the right to retain and instruct counsel is crucial as it ensures that individuals have access to legal representation, allowing them to navigate the legal system effectively. Being informed promptly of the reasons for arrest ensures accountability and transparency in the law enforcement process, which is a key aspect of legal rights. Lastly, the right to have the validity of one's detention reviewed through habeas corpus serves as a vital protection against unlawful detention, ensuring that individuals can challenge the legality of their imprisonment.

In summary, while remaining silent is an important principle, the question focuses on rights more explicitly defined within the context of arrest and detention, making it the correct choice for the one that does not belong to the traditional set of rights recognized under such circumstances.