Better Therapeutics (BTTX) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

November 24, 2021

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read the statements made by Better Therapeutics, Inc. (formerly Mountain Crest Acquisition Corp. II) under Item 4.01 of its Form 8-K dated November 24, 2021. We agree with the statements concerning our Firm in such Form 8-K; we are not in a position to agree or disagree with other statements of Better Therapeutics, Inc. (formerly Mountain Crest Acquisition Corp. II) contained therein.

Very truly yours,

/s/ Marcum LLP

Marcum LLP