This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
The drugs that form complexes with pyridoxal are: 
Select and explain. 
A. Isoniazid, B. Penicillamine, C. Rifampicin, D. Both A. and B.
D: Both A. and B.
Answer: D: Both A. and B. 
Explanation: Ans. D. Both (A) and (B)Isoniazid (anti-tuberculosis drug) and penicillamine (used to treat rheumatoid arthritis and cystinuria) are two drugs that complex with pyridoxal and pyridoxal phosphate resulting in a deficiency in this vitamin.