A 57-year-old man presents with depression and a history of obsessive-compulsive symptoms that began in his twenties and are mostly religious in nature. He has not responded to numerous previous trials of serotonergic medications at typical depression doses. He fairly recently began cognitive-behavioral therapy and has responded well to it; however, he continues to experience significant symptoms of obsessive-compulsive disorder (OCD), rating his symptoms a 7/10 in severity. His current medications include fluoxetine 80 mg/day and trazodone 50 mg/night. Which of the following is true regarding the appropriate dosing of selective serotonin reuptake inhibitors (SSRIs) in OCD?

a) Higher doses are needed for OCD compared to depression
b) Lower doses are sufficient for OCD compared to depression
c) OCD does not respond to SSRIs
d) SSRIs are contraindicated in OCD