A 6-year-old boy is brought to the pediatrician by his mother, who complains of low-grade fever, chronic cough and night sweats in her child. She describes the cough as productive, producing white sputum that is sometimes streaked with blood. She also says that her son has lost some weight in the last month. His vital signs include blood pressure of 115/75 mm Hg, heart rate or respiratory rate of 18/min., and temperature ot 36.6°C. physical examination, the patient is ill looking pulmonary auscultation reveals some line crackles in the right upper lobe. pediatrician suspects an active infection and performs Mantoux test. Intradermally injection of which of the following substances has been most likely used by pediatrician for the screening test In this clinical case?