<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A mother presents to the family physician with her 16-year-old son. She explains, Theres something wrong with him doc. His grades are getting worse, hes cutting class, hes gaining weight, and his eyes are often bloodshot. Upon interviewing the patient apart from his mother, he seems withdrawn and angry at times when probed about his social history. The patient denies abuse and sexual history. What initial test should be sent to rule out the most likely culprit of this patients behavior?? A: Complete blood count, B: Blood culture, C: Sexually transmitted infection STI testing, D: Urine toxicology screen, E: Slit eye lamp testing,  <response>: This is a question about a teenage boy presenting with symptoms of worsening grades, truancy, weight gain, bloodshot eyes, withdrawal, and anger. The key symptoms here are declining school performance, behavioral changes, bloodshot eyes, and weight gain. This presentation is most consistent with substance use, specifically marijuana use. Therefore, the initial test that should be ordered is a urine toxicology screen to check for drugs.D: Urine toxicology screen 