This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following is FALSE regarding a normal pregnancy? \nSelect and explain. \nA. Fall in free T4/T3 in 3rd trimester, B. TSH falls in the first and second trimester but increases in the third trimester, C. TSH rises in the first and second trimester but falls in the third trimester, D. There is an increase in Thyroid binding globulin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In pregnancy there is a relative iodine deficiency and increased renal excretion. Ref: Karla Philip, 33rd Edition, Page 304', 'role': 'assistant'}]