A 23-year-old is diagnosed to be suffering from Pulmonary tuberculosis. She visits her physician after 2  months for follow up. She feels fine, sputum & cough have reduced, no rise of night temperature. She has put on weight. She is taking  Isoniazid, Rifampicin Pyrazinamide and Ethambutol.

Since few days she is having a new complaint that she is not able to type properly because of failing vision. She asks her Physician if she needs change of her spectacles.Which of the following drugs may be causing her decline in vision:               Rifampicin. Isoniazid Pyrazinamide Ethambutol.