A 23-year-old man with schizophrenia treated with an antipsychotic presents to the emergency department with suicidal ideation and a specific plan but no attempt. What is the most appropriate immediate management?ADischarge with outpatient follow-up onlyBStart an antidepressant and send him homeCEnsure safety with constant observation, remove means of self-harm, and arrange urgent psychiatric assessment, likely requiring admissionDTell him to call a crisis line if he feels worseEIncrease antipsychotic dose slightly and review in 2 weeksCheck my answer