799
In a patient suffering from rheumatoid arthritis, we report the first simultaneous occurrence of two side effects of low-dose methotrexate: an acute megaloblastic anaemia and a pneumonitis.
 adverse event: an 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: an 