Q. Which Buddhist council was not held in Bihar?

Correct Answer: d) Fourth

Explanation:
– 1st Council: Rajagriha (Rajgir), Bihar (under Ajatashatru).
– 2nd Council: Vaishali, Bihar.
– 3rd Council: Pataliputra (Patna), Bihar (under Ashoka).
– 4th Council: Not in Bihar—held in Kashmir under Kanishka (Sarvastivada tradition) or in Sri Lanka (Theravada tradition).

Thus, the only council not held in Bihar is the Fourth.