A 45-year-old man with diabetes, diagnosed with pulmonary TB who started treatment two months ago, presents to you with a week's history of pins and needles in his hands and feet with associated numbness. He tells you that his symptoms started since he stopped taking the vitamins given to him at the start of his TB treatment.

Which of the following drugs is responsible for the symptoms described by the patient?
a. Pyrazinamide
b. Rifampicin
c. Ethambutol
d. Isoniazid
e. Streptomycin