This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Which of the following drugs used in MDR TB may lead to suicidal tendencies: 
Select and explain. 
A. PAS, B. Pyrazinamide, C. Cycloserine, D. None of the above
C: Cycloserine
Answer: C: Cycloserine 
Explanation: Psychiatric disturbances : The common offending drugs are cycloserine, quinolones and/or ethionamide. In cases of suicidal tendencies and other psychiatric disturbances, the first offending drug is cycloserine, followed by ethionamide and quinolones. These drugs will be withheld and fuher management of the patient will be done in consultation with the psychiatrist. Ref: