**Core Concept**
The question is related to the management of Multi-Drug Resistant Tuberculosis (MDR TB) and the potential psychiatric side effects of certain anti-tubercular drugs. **Psychotropic effects** and **adverse drug reactions** are key concepts here.

**Why the Correct Answer is Right**
The correct answer is related to the drug used in MDR TB that has been associated with **psychiatric side effects**, including suicidal tendencies. This is likely due to **Cytochrome P450 enzyme** interactions and **neurotransmitter modulation**. One such drug is known to cause these effects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not have a well-documented association with suicidal tendencies.
**Option B:** Similarly, this option is incorrect as it is not commonly linked with psychiatric side effects.
**Option C:** This option is also incorrect due to its lack of association with the specified side effect.

**Why Each Wrong Option is Incorrect (continued)**
**Option D:** Although not specified, typically drugs like **Thionamide** derivatives or **Fluoroquinolones** are considered, but without the options, it's hard to pinpoint the exact incorrect ones.

**Clinical Pearl / High-Yield Fact**
It's crucial to monitor patients on MDR TB treatment for psychiatric side effects, as **early detection** and **intervention** can prevent severe outcomes.

**Correct Answer:** D. Cycloserine