**Core Concept**
The question tests knowledge of the side effects of **antitubercular drugs**, specifically those that can cause **psychosis**. This requires understanding of the pharmacological properties of these drugs and their potential to affect the central nervous system.

**Why the Correct Answer is Right**
Although the correct answer is not specified, a well-known antitubercular drug that can cause **psychosis** is Cycloserine. This drug can cause neurological side effects, including **psychosis**, due to its ability to inhibit the synthesis of the neurotransmitter **glycine** and alter the metabolism of **glutamate**.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific answer choices, it's impossible to provide detailed explanations for each option. However, commonly used antitubercular drugs like Isoniazid, Rifampicin, and Ethambutol are less likely to cause psychosis compared to Cycloserine.
**Option B:** Similarly, without the specific options, it's challenging to provide a detailed explanation.
**Option C:** This option would be incorrect if it listed a drug not known to cause psychosis.
**Option D:** This option would also be incorrect if the drug listed does not have psychosis as a known side effect.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **Cycloserine**, an antitubercular drug, can have significant neurological side effects, including **psychosis**, which is a critical consideration in the management of tuberculosis, especially in patients with a history of psychiatric disorders.

**Correct Answer:** Correct Answer: D. Cycloserine.