You are answering a USMLE-style medical question. Question: A obstetrician is working in a developing country to help promote maternal health and fetal well being. While there, he delivers a baby who he suspects has congenital hypothyroidism, most likely caused by inadequate maternal iodine intake. Which of the following signs and symptoms would NOT be expected to be observed in this child? Options: A) Hypotonia B) Diarrhea C) Umbilical hernia D) Macroglossia Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.