## Core Concept
Formication is a tactile hallucination that creates a sensation as if ants are walking on or under the skin, often associated with cocaine use or certain neurological conditions. Delusion of persecution is a false belief that one is going to be harmed, harassed, and so forth by an individual, organization, or other group. These symptoms can occur in various psychiatric and neurological disorders.

## Why the Correct Answer is Right
Cocaine-induced psychosis is known to cause a range of symptoms including formication, which is a classic symptom due to its direct effect on dopamine and serotonin receptors in the brain. Delusions of persecution can also occur in the context of cocaine-induced psychosis, as the substance can induce a state of paranoia and psychosis. This combination of formication and delusion of persecution is particularly characteristic of cocaine use.

## Why Each Wrong Option is Incorrect
**Option A:** While substance-induced psychoses can cause a variety of symptoms, the specific combination of formication and delusions of persecution is more uniquely associated with certain substances like cocaine rather than a broad category like "A."

**Option B:** This option might refer to another condition or substance but does not specifically align with the well-known combination of formication and delusions of persecution as directly as cocaine does.

**Option D:** Similar to option B, without a specific reference, it's hard to directly refute, but given the classic association of formication with cocaine use, options that do not directly reference cocaine or a closely related condition are less likely to be correct.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that formication, or the sensation of bugs crawling under the skin, is classically associated with cocaine use and can be a part of a larger syndrome that includes delusions of persecution. This combination can help in diagnosing substance-induced psychosis, particularly in cases where patients present with unusual sensory complaints and paranoid ideation.

**Correct Answer: C.**