**Core Concept:** Contraindications in medicine refer to circumstances under which the use of a certain medication or treatment is not recommended due to potential harm to the patient. For anti-tuberculosis drugs, the risk-benefit analysis must be carefully considered, especially in pregnancy.

**Why the Correct Answer is Right:** The correct answer is based on the potential risks associated with exposure to anti-tuberculosis drugs during pregnancy. These drugs can have detrimental effects on the developing fetus, leading to congenital anomalies, developmental abnormalities, and even spontaneous abortions. The most commonly used drugs in anti-tuberculosis treatment include isoniazid, rifampicin, pyrazinamide, and ethambutol.

**Why Each Wrong Option is Incorrect:**

A. **Not Bolded**: This option is incorrect because it does not address the specific contraindications associated with anti-tuberculosis drugs in pregnancy.
B. **Not Bolded**: Although streptomycin is used in anti-tuberculosis treatment, the question specifically asks about the anti-tuberculosis drugs mentioned above (isoniazid, rifampicin, pyrazinamide, and ethambutol).
C. **Not Bolded**: Ethionamide is a drug used in anti-tuberculosis treatment, but it is not specifically mentioned in the question.
D. **Not Bolded**: Prothionamide is another drug used in anti-tuberculosis treatment, but it is not mentioned in the question.

**Clinical Pearl / High-Yield Fact:** In clinical practice, healthcare providers must weigh the potential benefits of anti-tuberculosis treatment against the potential risks for the mother and the developing fetus. If possible, alternative drugs or treatment strategies should be considered to ensure the best possible outcomes for both the mother and the child.