This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Tadalafil should not be given with: 
Select and explain. 
A. Vasodilator, B. Antibiotics, C. Vasoconstrictors, D. Valproate
A: Vasodilator
Answer: A: Vasodilator 
Explanation: Ref. KDT. Page. 190
TALADAFIL:

More potent and longer acting congener of sildenafil
t1⁄2 18 hours and duration of action 24–36 hours.
Acts faster
Side effects, risks, contraindications and drug interactions are similar to sildenafil.
Because of its longer lasting action, nitrates are contraindicated for 36–48 hours after tadalafil.  (vasodilators)