Incorrect answers

[cinjon]

I did some spot checks recently and these from the test set came are just incorrect. I didn't look very hard otherwise, but any idea what's up? Were these entered incorrectly? Is this known?

Naturalists who concentrated on natural elements and processes are associated with which of the following?
A. Daoism
B. Yin-Yang School
C. Mengzi
D. Humanistic Buddhism

Test answer said B, but internet (and chatgpt / claude) says A.

How many human polyomaviruses are known at present?
A. 100
B. 1
C. 10
D. unknown

Test answer said A, but internet says C.