Help me settle a dispute between my wife and I. Which one of us is right - me or her?

On several occasions my wife has asked me a question in which I have no definitive answer or scientific opinion. For example, my wife will ask me something like, "do you think the covid-19 virus was engineered in a Wuhan Lab?"

My answer will be something along the lines of: "I don't know. From the information I've read, I would say no because it doesn't have properties of an engineered virus, but I don't trust China, neither do I trust the US's intelligence agencies, so I don't know."

Then my wife will say: "I didn't ask you what you knew. I asked you what do you think."

My response: "I told you my thoughts. What else do you want me to say?"

Wife: "So, you can't tell me your opinion. You don't have an opinion as to whether or not the virus was engineered?"

Me: "I am telling you my opinion, but I can't give a definitive answer as to whether or not the virus was engineered because I don't know."

Wife: "But you can give me your opinion. I asked for your opinion."

Me: "I gave you my opinion."

Wife: ""I don't know" is not an opinion."