Galactorrhea may be associated with the use of all the following drugs except -: (A) Methyldopa, (B) Tricyclic antidepressants, (C) Pyridoxine, (D) Phenothiazine
Answer is C. Lactation in the absence of breastfeeding is known as galactorrhea. Drugs causing galactorrhea are dopamine antagonists like antipsychotics (phenothiazines, butyrophenones), antidepressants, antiemetics and dopamine-depleting drugs like reserpine, methyldopa. 
These dopamine antagonists elevate prolactin concentrations and result in galactorrhea.