【正确答案】 B

【答案解析】Clients who take sulfasalazine are susceptible to developing impaired folic acid absorption. Common clinical manifestations of a folic acid deficiency are gastrointestinal disturbances such as anorexia, nausea, vomiting, and a smooth, beefy red tongue. The client should be encouraged to eat food high in folic acid such as green leafy vegetables, meat, fish, legumes, and whole grains.