The phrase "answer on that subject" is not correct in standard written English.
The correct expression would be "answer on that topic" or "answer regarding that subject."
Example: "I would appreciate it if you could provide an answer on that subject during the meeting."
Alternatives: "respond to that topic" or "reply about that subject."
For us, the biggest challenge in growing our restaurant company was getting the right infrastructure in place – payroll, cashflow, logistics — so I'll be paying close attention to answers on that subject.
The city's decision not to proceed to the Supreme Court to "give a definitive answer on the subject creates a situation where the Second Amendment means one thing in Washington, D.C., and something different across the border in Maryland," he said.
According to an account in The Birmingham News, the Blount campaign had produced the commercial by deleting part of Mr. Sparkman's lengthy answer to a question about busing during a radio interview, and switching a question and answer on the subject.
Perhaps the honorable member may be able to give a satisfactory answer on this subject.
Mandel did not explain his sudden shift, using the remainder of his answer on the subject to advocate for adoption and to call Brown an "extremist" who supports abortion in the ninth month of pregnancy.
The government's issuing of five different answers on the subject over one week leads one to suggest to them that it is easier to keep your story straight if you tell the truth.
And while she and her colleagues would like to offer definitive answers on this subject, the fact is that few now exist.
His mother suggested examiners may not have been able to read his writing, but Corbyn said it was more likely that he gave overly long answers on subjects that interested him and "forgot the rest of it".
[Update: Answers on this subject can be seen here.
