MCT is defined as Minimum Connection Time - namely the amount of time the airport feels it needs, to transfer passengers and their bags to their next flight.

In terms of Special Assistance, I would select the option. It will provide you with a wheelchair/buggy which can be quicker than walking. Secondly, you will totally skip the security line (as they will put you both at the very front).

While the latter is a tad cheeky (if not 100% required), I feel it might be useful to save you time. Plus, and not to contradict myself, but with a Husband recovering from cancer (I hope the remission remains), I think you are within your rights to request and use the service.

Safe travels,

M