"The Two Towers gets as near as possible to finding a title to cover the widely divergent Books 3 and 4; and can be left ambiguous – it might refer to Isengard and Barad-dūr, or to Minas Tirith and B; or Isengard and Cirith Ungol." (Letter 140)
Also, cf. the note to that letter:
"1. In a subsequent letter to Rayner Unwin (no. 143), Tolkien is more definite that the Two Towers are 'Orthanc and the Tower of Cirith Ungol'. On the other hand, in his original design for the jacket of The Two Towers (see no. 151) the Towers are certainly Orthanc and Minas Morgul. Orthanc is shown as a black tower, three-homed (as seen in Pictures no. 27), and with the sign of the White Hand beside it; Minas Morgul is a white tower, with a thin waning moon above it, in reference to its original name. Minas Ithil, the Tower of the Rising Moon."
Debated -- yes; definitely answerable -- no.
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