This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
An anti-hypeensive drug that causes positive coomb&;s test is 
Select and explain. 
A. Methyldopa, B. Clonidine, C. Hydralazine, D. Sodium-nitropruside
A: Methyldopa
Answer: A: Methyldopa 
Explanation: Alpha-methyldopa causes autoimmune hemolytic anemia Coombs test detects antibodies against foreign red blood cells. (REF. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D TRIPATHI-6th edition. Page No-547)