<prompt> Answer this question truthfullyWhat is the probable diagnosis for a patient who presents with painful oral ulcers and mildly elevated LFTs, and has recently been diagnosed with rheumatoid arthritis and started on medical therapy?  <response>: <reason> The likely diagnosis for this patient is a side effect of methotrexate, which is a commonly used medication for the treatment of rheumatoid arthritis. Methotrexate can cause oral ulcers and liver toxicity, which can manifest as mildly elevated liver function tests LFTs. Symptoms of methotrexate-induced liver toxicity may include abdominal pain, nausea, vomiting, and fatigue. Treatment for methotrexate-induced liver toxicity may include discontinuing the medication, reducing the dose, or switching to a different medication. It is important for patients taking methotrexate to have regular liver function tests to monitor for any potential side effects. 