This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Biochemical test in thiamine deficiency is: \nSelect and explain. \nA. FIGLU test, B. Histidine test, C. Erythrocyte transketolase test, D. Ferric chloride test', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C. Erythrocytes transketolase testa. In thiamine deficiency - the most reliable is the measurement of whole blood or Erythrocytes Transketolase activity.b. FIGLU test and Histidine test - Formimino-glutamate (FIGLU), a catabolite of histidine, transfers its formimino group to H4- to form N5 formimino-H4 folate. In folate deficiency FIGLU will accumulate after oral challenges with histidine.c. FeCl3 test: -i. In phenyl ketonuria - gives Emerald green, when tested with fresh urineii. In maple-syrup urine disease - gives navy blue colour when tested with urineiii. Also used to detect aceto-acetic acid in Gerhardt's test", 'role': 'assistant'}]