I got this one wrong on my test, how to solve and what is the correct answer ?

Question 2 0 / 1 po NDC 10019-033-72 Fentanyl Citrate Injection, USP 250 mcg/5 mL R only Each ml contains fentanyl citrate equivalent to 50 mc 50 mcg/mL (0.05 mg/mL) (0 05 mg) fentanyl base in Water for Injection. ph 4.0 75: sodium hydroxide andlor hydrochloric acid added 10 x 5 mL DOSETTE Ampuls * needed, for pl adjustment. Contains no preservative Usual Dosage: See package insert for complete FOR INTRAVENOUS prescribin information PROTECT FROM LIGHT: Keep covered in carton unti OR INTRAMUSCULAR USE time of use. Store at controlled room temperature 15-30- (59-86'F). Baxter SiLEDERLE" To open ampuls, ignore color line: break a said. for ain affiliate of constriction Barter Healthcare Corporation Deerfield, IL 80015 USA DOSETTE is a registered trademark AM. Robin by. Exding-Sion, Inc, Cherry Hill, N3 08003 460-120-00 Company How many ml of Fentanyl will you administe is the order is for 0.2 mg? 4 mL 0.25 mL O 125 mL O 50 mL