Bhagavad Gita, Chapter 6, Verse 39

This doubt of mine, O Krishna, you should completely dispel; for it is not possible for any but You to dispel this doubt.

Some doubts are real enough that they genuinely need a real, direct answer, not just reassurance.

Arjuna isn't looking for comfort here, he's looking for an actual resolution. Naming exactly who he trusts to answer it shows how seriously he's taking the question, not brushing it aside.