An eminent science professor was found to be in possession of unidentified human body parts, which were stored in his room in the university. His colleagues recall the professor's obsession with his research projects over the past year, and called in the police when the professor's daughter-in-law went missing. It is also known that: The professor had not spoken to his son for two years following an argument. The daughter-in-law visited the professor at the university on a regular basis. The professor had a reputation for being a loner and for working all hours in his study. The professor had once spent several months in a rehabilitation centre. The professor's current research project is concerned with the storage of body organs.

Question: The daughter-in-law had gone away following an argument with her husband, the professor's son.
Options:
A. true, B. false, C. uncertain
Answer: "C"